Answer:
the kingdom animalia contains the organisms that r multicellular
The light reactions of photosynthesis use chemiosmosis to produce ATP that will be used in the Calvin cycle. The electrochemical gradient that drives this chemiosmosis is formed across which structure(s)?
Answer: Thylakoid membrane.
Explanation:
Photosynthesis is a chemical process carried out by plants, algae, and certain microorganisms, whereby solar energy is captured and converted into chemical energy in the form of ATP and organic compounds. During electron transfer, the protons (H +) of the H atoms are sent to the interior of the thylakoids through their membranes, producing an energy gradient. This electrochemical gradient generates enough energy to phosphorylate ADP and produce ATP, similar to the oxidative phosphorylation that occurs in mitochondria. The end products are ATP and NADPH.
Summarize the steps of the scientific method.
Answer:
1) make an observation- what problems do you notice in the natural world? these probelms all have a solution, what do you think would be a way to solve them,
2) create a hypothesis- create an educated guess on how your solution to fix the problem will work, it must be highly specific and it cant be a yes or no answer
3) test the hypothesis- test to confirm your theory
4) draw conclusions- was this a good solution or not? why?
A collection of closely related animals or plants that share a similar genetic evolutionary history but cannot necessarily interbreed to produce fertile offspring is referred to as a _____. species genus tetraploid polyploid diploid
Answer:
Genus
Explanation:
Genus is a group of related plant or animal species. These group of species share a common evolutionary history which means that they are descended from a recent or distant common ancestor. These group of plant or animal species can not interbreed among themselves as the individuals of the different species can not interbreed to give rise to the fertile progeny.
Example: Solanum is a plant genus that includes many species such as nigrum, tuberosum, etc. The plants of S. nigrum and S. tuberosum can not interbreed in nature as they belong to different species.
A garden aboard the International Space Station allows space scientists to research the growth of plants in space. This research is important because astronauts will need to grow their own food to survive long space journeys.
What challenges would you expect scientists to face when growing plants in space? What challenges will the astronauts have with meeting their own energy needs?
Scientists are also evaluating plants for gene mutations that would help them grow better in space environments. What traits could a plant have that would help it grow better in space?
Answer:
Some of the challenges that scientists might face in space when growing plants would be the fact that plants must have carbon dioxide to carry out their process, which is why they are grown in special chambers. It is true that the astronauts would put off some carbon dioxide, but perhaps not enough. You would also be trying to grow plants in a zero gravity environment, which they aren't accustomed to.
The astronauts would have to be able to provide an extremely large amount of food in order to meet their nutrition needs. There would have to be enough room to grow an adequate amount of food aboard the ship. The plants would also need to be able to produce more than one crop per growing.
If scientists could genetically modify plants to help them grow better in space, they would need to make them able to thrive in a low gravity setting. They would also need to try and engineer them to need less water to survive. They would need to be strong enough to survive the lift off when going into space. The plants would also need to be able to regenerate and produce vast quantities of food.
Explanation:
The challenges that you could expect scientists to face when growing plants in space are microgravity, limited space, light availability, etc.
Scientists are anticipated to confront many obstacles while cultivating plants in space:
Microgravity: The lack of gravity in space has an impact on plant growth and development. Space and resources are limited inside a spaceship or space station. Because sunlight is restricted in space, artificial lighting systems must be employed for photosynthesis.Temperature and humidity control: It is difficult to maintain appropriate temperature and humidity levels within a spacecraft's controlled environment.Astronauts, on the other hand, may encounter difficulties in satisfying their own energy requirements during extended space journeys:
Food supply is in short supply.
Nutritional necessities.
Energy use.
Plants with the following characteristics may grow better in space:
Dwarfism: Due to restricted vertical growth area and lower gravitational effects, plants with shorter height might be favourable in space.
Compact and efficient root systems: Plants with well-developed root systems that can absorb water and nutrients in tight locations will flourish in space habitats' limited root space.
Thus, scientists are currently researching and performing experiments to find and create plants with these desired features in order to increase the effectiveness of plant growth in space and enable astronauts to generate their own food sustainably during extended space trips.
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Where in a sarcomere do you find titin and tropomyosin
Answer:
The titin in the sarcomere extends from the Z-line. The tropomyosin along with troponin binds inside the grooves between actin filament.
Explanation:
The sarcomere is the unit of muscle tissue. The titin protein is very large and extends from the sarcomere. The titin binds to the thick filaments and it provides the elasticity.
The tropomyosin protein binds to the another protein, troponin. This complex help in contraction of muscles. The calcium binds to the troponin complex and thereby activating it and allow contraction of muscles.
What is the role of renin in the secretion of aldosterone?
Answer:
Explanation:
Aldosterone is a hormone which is produced by the adrenal glands which are present above the kidneys. The role of aldosterone is to regulate the blood pressure. It causes the reabsorption of water and salts into the bloodstream during the kidney filteration process. Hence, maintains the blood volume, restors blood pressure and salt level.
Renin is an enzyme. It facilitates chemical reactions which stimulates the synthesis of angiotension II, it directs the synthesis of aldosterone.
Renin, produced by the kidneys in response to low blood pressure or blood volume, triggers a chain reaction leading to the secretion of aldosterone. Aldosterone then promotes sodium and water reabsorption in the kidneys, thereby increasing blood volume and pressure. This process is part of the renin-angiotensin-aldosterone system (RAAS).
The role of renin in the secretion of aldosterone is crucial in the regulation of blood pressure and fluid balance, through the renin-angiotensin-aldosterone system (RAAS). When blood pressure or blood volume is low, specialized cells in the kidneys, known as juxtaglomerular (JG) cells, secrete the enzyme renin. Renin then catalyzes the conversion of angiotensinogen, a blood plasma protein produced by the liver, into angiotensin I. This is further converted into angiotensin II in the lungs by angiotensin-converting enzyme (ACE). Angiotensin II serves multiple roles:
It acts as a potent vasoconstrictor, narrowing blood vessels to increase blood pressure.It stimulates the release of the hormone aldosterone from the adrenal cortex.It increases thirst and the secretion of antidiuretic hormone (ADH), both of which contribute to raising blood pressure.Aldosterone promotes sodium and water reabsorption in the kidneys, which increases blood volume and blood pressure. This process ensures homeostasis in the body by adjusting fluid and electrolyte balance in response to varying conditions.
Which of the following describes the chromosomes in a fertilized egg?
A. Only from the mother
B. Only from the father
C. The diploid number
D. The haploid number
A fertilized egg contains the diploid number of chromosomes, which includes one set from the mother and one from the father, totaling 46 chromosomes in humans.
Explanation:The chromosomes in a fertilized egg are diploid, which means they contain two sets of chromosomes, one set from each parent. In humans, this amounts to a total of 46 chromosomes, with 23 being maternally derived (from the mother's egg) and 23 paternally derived (from the father's sperm). Therefore, the answer to the question would be C. The diploid number. Haploid cells, like the sperm and egg, have only half the number of chromosomes, which combine to form a diploid cell during fertilization. This cellular fusion results in a zygote, the initial cell of a new organism that contains a full set of chromosomes.
During the 1950s, a scientist named Lysenko tried to solve the food shortages in the Soviet Union by breeding wheat that could grow in Siberia. He theorized that if individual wheat plants were exposed to cold, they would develop additional cold tolerance and pass it to their offspring. Based on the ideas of artificial and natural selection, do you think this project worked as planned?
A. Yes; the wheat probably evolved better cold tolerance over time through inheritance of acquired characteristics.
B. No, because Lysenko took his wheat seeds straight to Siberia instead of exposing them incrementally to cold.
C. No, because there was no process of selection based on inherited traits. Lysenko assumed thatexposure could induce a plant to develop additional cold tolerance and that this tolerance would be passed to the plant's offspring.
D. Yes, because this is generally the method used by plant breeders to develop new crops.
Answer:C
Explanation:
In order to draw a conclusion he needed to do an experiment based on his hypothesis first, then be able to conclude from his results if these breeds can real survive the cold weather.
Mitochondria and chloroplasts, organelles inside of eukaryotic cells, have their own membranes and genetic material. This is evidence of A. The endosymbiotic theory. B. Abiogenesis. C. Coevolution. D. Horizontal gene transfer.
Answer: The answer is A
Explanation:...Where the endosymbiotic theory deals with bacterial characteristics and the development of the mitochondria and chloroplast in eukaryote cells.
What are the receptors for static equilibrium?
The receptors for static equilibrium are mechanoreceptors located in the inner ear. They include hair cells with stereocilia which are found in the vestibule of the inner ear. These receptors detect gravity and linear acceleration, contributing to the individual's sense of balance.
Explanation:The receptors for static equilibrium are specific types of mechanoreceptors located in the inner ear. These receptors, known as hair cells with stereocilia, can sense head position, movement, and the body's motion. The hair cells are situated within the vestibule of the inner ear. Specifically, the utricle and saccule sense head position, and the semicircular canals sense head movement. These cells respond to static equilibrium stimuli including gravity and linear acceleration (such as when the head changes orientation or moves in a straight line). All the signals generated are transmitted through the vestibulocochlear nerve to the brain stem and cerebellum, allowing the body to maintain balance.
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A geneticist is mapping the chromosomes of the newly captured gremlin. Stripe is heterozygous for three linked genes with alleles Ee, Hh, and Bb, that determine if gremlins are evil (E), have hair (H), and biting teeth (B). In order to determine if the 3 genes were linked, a standard testcross was done, and the 1000 offspring had the following genotypes: 48 ee Hh bb 36 ee hh Bb 400 ee Hh Bb 4 Ee Hh Bb 426 Ee hh bb 46 Ee hh Bb 38 Ee Hh bb 2 ee hh bbChoose the alleles on the homologous chromosomes of the heterozygous individuals with the correct gene order.What is the recombination frequency between genes E and B? a. 8.4% b. 9.0% c. 42.6% d. 9.4% e. 10.0%
Explanation:
A geneticist is mapping the chromosomes of the newly captured gremlin. Stripe is heterozygous for three linked genes with alleles Ee, Hh, and Bb, that determine if gremlins are evil (E), have hair (H), and biting teeth (B). In order to determine if the 3 genes were linked, a standard testcross was done, and the 1000 offspring ...
Answer:
The correct gene order is H-e-B
Recombination frequency between genes E and B = 10%
Explanation:
In linkage parental genotype is always in greater number than recombinants, hence:
400 = eeHhBb : Parental
426 = Eehhbb : Parental
Double crossovers have the smallest number hence:
EeHhBb = 4 : Double recombinant
eehhbb = 2 : Double recombinant
Double cross over places middle allele from one sister chromatid to other one. Hence a non parental allele of the middle gene is present with parental alleles of the flanking genes.
Here recombinant type is EHB and parental type is eHB . Only gene order H-e-B would result in double cross over which would give EHB and ehb double recombinants. Hence, the correct gene order is H-e-B.
Single crossover between gene E and B would result in Heb and hEB progeny ( 48 and 46 )
Recombination frequency between E and B = [(Double recombinants + Single E and B recombinants) / Total progeny)*100]
= [ (4 + 2 + 48 + 46)/1000] * 100
= 100/1000
= 0.1 * 100 = 10%
Which of the following are characteristics of arthropods? 1. Protostome development 2. Bilateral symmetry 3. A pseudocoelom 4. Three embryonic germ layers 5. A closed circulatory system
Answer: 1. Protostome development./2. Bilateral symmetry/4. Three embryonic germ layers
Explanation:
Over 600 million years ago some animals invaded aquatic and terrestrial environments in the pre-Cambrian period. These animals were enforced by huge evolutionary irradiation, and now they occupy every environment on planet Earth. From tiny insects and crustaceans smaller than 1mm in length to giant crabs from Japan that can reach 3m (with open legs), the arthropods are found in all size models, with an estimated number of more than one million species described. Concerning characteristics they are - Bilateral, triploblastic( Three embryonic germ layers), prostomial. Internally and externally segmented body, divided into at least two regions, head, and abdomen; typically with a cephalic shield or carapace. Opened circulatory system; the dorsal heart is a muscle pump with lateral Ostia for blood return.
A common column material used in size-exclusion chromatography is dextran, a polysaccharide of glucose. Which type of interaction most likely occurs between proteins and the dextran column material?
Answer:
Hydrogen bonding
Explanation:
A hydrogen bond is a form of the electrostatic force of attraction which takes place between the hydrogen atom and a more electronegative atom such as nitrogen, fluorine, and oxygen. Hydrogen bond falls in the category of weak forces. In size-exclusion chromatography, the type of interaction that takes place between the proteins and dextran is hydrogen bonding. The hydrogen bonding is possible because dextran, being a polysaccharide of glucose has several hydroxyl groups and thus, they get involved in the hydrogen bonding.1. What limits do common names have?
They depend on geography.
They often use multiple words.
They are non-descriptive of the organism.
They are descriptive of the organism.
They can be in different languages.
None of the above
Answer:
Explanation:
Common names are local names that are given to organisms. These names are widely and locally accepted even within scientific bodies in order to avoid the rigors of having to use latin names of organisms.
Some of the limits of using common names are:
1. They can depend on geography: some common names are restricted in their use based on their acceptance by set of people. In some other climes, they might not be accepted. This is one big limitation in using common names.
2. They often use multiple words: within a particular area, an organism can be called different names. This is yet another big limitation of common names.
3. They are can be descriptive or non-descriptive of the organism: some common names are descriptive and they can easily tell us about an organism. Others might not even relate to to the organism at all.
4. They can be in different languages: Most languages have a common name for all organisms. This pose a serious scientific barrier when studying such species.
Common names often depend on geography, use multiple words, and can be non-descriptive or overly descriptive. They can also exist in different languages, creating potential confusion.
Explanation:The common names of organisms often have certain limitations. Firstly, they often depend on geography. This means a species might have one common name in one region and another name in a different region. Secondly, they often use multiple words which can complicate their usage. Thirdly, they can be non-descriptive or overly descriptive of the organism. For instance, a 'silverfish' is not a fish, but an insect. Lastly, they can exist in different languages, causing confusion.
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______ contains large amounts of potassium
A. Nephridium
B. Malpighian Tubes
C. Kidneys
D. None of the above
Answer:
Option B, Malpighian Tubes
Explanation:
In excretory system of Arthropods, the malphigian tubules constitute to be the main excretory organs in which bicarbonates of sodium and potassium, uric acid and water are formed. These maplhigian tubules are able to reabsorb the bicarbonates of potassium and sodium and transfers them into the blood known as haemolymph. The potassium ions are pumped out from the tubule into blood by potassium ion pump
Hence, option B is correct.
Use the model to explain how celiac disease interrupts the normal transportation of energy and other nutrients from the digestive system to the circulatory system.
Answer:
According to the model, the "villi" of small intestines is being damaged as an impact of celiac disease. Small intestines are responsible for absorption of nutrients and minerals from food, this occurs through villi, in case of damaged villi absorption is interfered, thus disturbing the digestive system. If the nutrients, minerals or vitamins are not being absorbed well by small intestines then they will be excreted out of the body and will not be transported to the blood and other areas, this would result in deficiency of minerals and vitamins in blood that cause weakness.
Answer: Plato Answer
The fingerlike shape of the villi is very important for nutrient absorption because it increases the surface area of the small intestine. In celiac disease, the villi flatten, decreasing the surface area of the small intestine. As a result, fewer nutrients get absorbed. Also, the model shows that celiac disease damages the epithelial cells of villi. The epithelial cell layer is important for the diffusion of nutrients to the capillaries. Without a healthy epithelial cell later, fewer nutrients may be absorbed, and the body may not have enough energy to perform its functions.
How has the eye accomplished correction for spherical aberrations? Fill in the blanks. The _____ is flatter at its ____ than at its ______, and the ______ is denser in the center and hence refracts more strongly at its core than at its outer layers.
Answer:
Cornea, margin, center, lens
Explanation:
Spherical aberration is defined as a class of aberration which is found in various optical systems which use the elements with various spherical surfaces.
The eye accomplished correction for spherical aberrations through cornea and lens.
The cornea is a transparent front part of eye. In humans, the cornea's refractive power is about 43 dioptres. The cornea is flatter in shape at it margin than at its center.
The lens in the eye focuses light rays which pass through it so that clear images of objects can be created which are positioned at different distances. Eye lens is of ellipsoid and biconvex shape. It is denser at the center.
Which vessel leaves the right ventricle of the heart to take oxygen-poor
Answer:
Pulmonary artery
Explanation:
The pulmonary artery delivers oxygen poor blood to the lungs that comes from the right ventricle of the heart. The pulmonary artery is also the only artery in the body that carries unoxugenated blood. When the blood goes to the lungs, it picks up oxygen and drops off carbon dioxide to be expelled from the body. The pulmonary vein then takes the oxygen-rich blood and brings it back to the heart.
Parland’s alligator population has been declining in recent years, primarily because of hunting. Alligators prey heavily on a species of freshwater fish that is highly valued as food by Parlanders, who had hoped that the decline in the alligator population would lead to an increase in the numbers of these fish available for human consumption. Yet the population of this fish species has also declined, even though the annual number caught for human consumption has not increased.
Which of the following, if true, most helps to explain the decline in the population of the fish species?
(A) The decline in the alligator population has meant that fishers can work in some parts of lakes and rivers that were formerly too dangerous.
(B) Over the last few years, Parland’s commercial fishing enterprises have increased the number of fishing boats they use.
(C) The main predator of these fish is another species of fish on which alligators also prey.
(D) Many Parlanders who hunt alligators do so because of the high market price of alligator skins, not because of the threat alligators pose to the fish population.
(E) In several neighboring countries through which Parland’s rivers also flow, alligators are at risk of extinction as a result of extensive hunting.
Answer:
(C) The main predator of these fish is another species of fish on which alligators also prey.
Explanation:
The ecosystems are complex systems, and removing one species of them, always has a chain reaction and affects the population of the other species, be it in a positive or negative manner. In this case, the alligators prey upon fish, multiple different species. The alligators though have been removed from the ecosystem, thus the apex predator exists no more. This has opened up the top predator niche in the food chain in this particular ecosystem. The predatory fish species had no predators of its own, so its population increased, thus it needed more food, and that food was obtained by hunting the other fish species, resulting in a decline in the population of the other species of fish. Only when the carrying capacity is reached in the ecosystem for the predatory fish, the population of the other fish will stop declining.
During which phase of mitosis do the chromosomes line up on a plane equidistant from the two spindle poles?
Answer: Metaphase; chromosomes line up at the metaphase plate equidistant from the two spindle poles.
During metaphase of mitosis, chromosomes line up in the middle of the cell's two poles on a plane called the metaphase plate. At this stage, the chromosomes are at their peak condensation and sister chromatids are still closely bonded. Ready for the next phase, the microtubules plan to separate these chromatids, pulling each to opposite cell poles.
Explanation:The phase of mitosis during which the chromosomes line up on a plane equidistant from the two spindle poles is called metaphase. Here, all of the chromosomes align on a plane named the metaphase plate, or equatorial plane, which is situated midway between cell's two poles. During metaphase, sister chromatids are still closely attached to each other by means of cohesin proteins. This stage also marks the point when the chromosomes reach their highest level of condensation.
Following this stage, the microtubules are prepared to pull these sister chromatids apart, moving one of each pair to opposing sides of the cell. This orderly process ensures that each daughter cell would receive an exact replication of the cell's DNA.
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Anybody know this?
The organ that produces the egg cell in the life cycle of the pine is called the:
ovules, antheridia, or archegonium
Answer:
Ovules
A
Explanation:
The ovule can be found on a megasporophyll, which itself is located on a scale. On each megasporophyll of the female strobilus two seeds can develop after fertilization. In each megasporangium (the female carrier of spores) a megasporocyte is present which leads to four megaspores after meiosis.
The colonization of land by animals: took place billions of years ago.was made easier by high atmospheric levels of carbon dioxide.preceded the presence of plant species on land.may have taken place independently by a variety of species descended from aquatic ancestors.
Answer: the correct answer may have taken place independently by a variety os species descended from aquatic ancestors.
Explanation:
Scientists think that life started in the oceans as early as 4 to 4.2 billion years ago.
Bioinformatics includes _____. I. using computer programs to align DNA sequences II. creating recombinant DNA from separate species III. developing computer-based tools for genome analysis IV. using mathematical tools to make sense of biological systems II and III I and II I, III, and IV II and IV
Answer: the correct answer is I, III and IV
Explanation:
Bioinformatics include using computer programs to align DNA sequences, developing computer-based tools for genome analysis and using mathematical tools to make sense of biological systems.
If a nearsighted person has a far point df that is 3.50m from the eye, what is the focal length f1 of the contact lenses that the person would need to see an object at infinity clearly?
Answer:
[tex]-3.50[/tex] meter
Explanation:
A nearsighted person uses concave lens.
Given -
Far point i.e distance of object [tex]= - 3.5[/tex] meter
Distance of image is not given . Hence we will assume that the image can be formed at any distance. We will take "di" [tex]=[/tex] infinity
As we know
[tex]\frac{1}{f} = \frac{1}{di} + \frac{1}{df} \\[/tex]
Substituting the given values in above equation, we get -
[tex]\frac{1}{f} = \frac{1}{infinity} + \frac{1}{-3.50}\\ \frac{1}{f} = 0 + \frac{1}{-3.50}\\ f = -3.50[/tex]
Hence, the focal length of the contact lens is equal to [tex]-3.50[/tex] meter
PLZ HELP I NEED IT ANSWERED NOW THANKS!! Based on the diagram above, which layer of the intestine contains glands that secrete intestinal juices for digestion?
A. A
B. B
C. C
D. D
Answer:
A.
Explanation:
Layer A is the mucosa of the intestinal tract. It where absorption and secretion takes place. This layer also contains glands like Brunner's gland, which secretes fluids to protect the lining of the intestines from the acidic juices of chyme. Secretions of the mucosa also contain enzymes and hormones that aid in digestion.
Which of the following statements correctly describes what happens to the diaphragm during an inhalation, when the lungs inflate?
A. The diaphragm contracts and flattens.
B. The diaphragm expands.
C. The diaphragm only moves during exhale.
D. The diaphragm returns to its resting state.
A.
When you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. This increases the space in your chest cavity, into which your lungs expand.
Answer:
The correct answer is A. During an inhalation, the diaphragm contracts and flattens.
Explanation:
In inhalation (incorporation of air into the body) the diaphragm muscle and the intercostal muscles contract. The diaphragm descends from its position and the intercostal muscles, as a consequence of the posture they adopt, elevate the ribs. When this happens, the volume of the rib cage increases together with the volume of the lungs, and more space is available. As the volume of the lungs rises, the air pressure in them decreases. Product of the pressure difference (now greater in the exterior) the air penetrates quickly through the respiratory tract to the inside of the lungs.
The molecules that make up food contain energy. How does the human body get energy from the food molecules?
A- by breaking and reforming chemical bonds in the molecules
B- by combining the molecules together
C- by using them to from ionic bonds
D- by adding energy to the molecules
Answer: A: by breaking ans reforming chemical bonds in the molecules
Explanation: There is energy stored in chemical bonds between food molecules (this is referred to as ATP, or Adenosine TriPhosphate, which is the type of energy your body uses). When chemical bonds are created, some energy is stored in those bonds (personally, I like to think that it's because the bonds need energy to stay bonded, but there is no science to prove this). When one of these bonds are broken, the energy that was stored is released, and can then be used by your body. Your body then uses a different type of energy (called ADP, or Adenosine DiPhosphate) to reform the bonds, which then go on to become waste products.
Answer:
It's A. By breaking them down and reforming chemical bonds in the molecules.
Explanation:
<3
Competent cells
are able to take up naked DNA.
are antibiotic resistant.
occur naturally.
can be created in the laboratory.
are able to take up naked DNA, occur naturally AND can be created in the laboratory.
Answer: Competent cells are able to take up naked DNA, they occur naturally and can be created in the laboratory
Explanation: Competent cells are cells that can modify its genetic make up and take other DNA using transfomation. Competent cells are commonky made from e.coli because it can replicate faster, readily available for use. DNA is cleavedusing restriction enzymes making up sticky ends.
A go cart rolling at a speed of 2 m/s begins to accelerate down an inclined street at a constant rate of 1.5 m/s¶. It takes the go cart 6 seconds to reach a level portion of the street. At what speed will the cart be traveling by the time it reaches level ground.
Answer:
[tex]11\frac{m}{s}[/tex]
Explanation:
As per the Newton's first law of motion,
[tex]v = u + at\\[/tex]
where "v" is the final speed
"u" is the initial speed
"a" is the acceleration
and "t" is the time taken
Substituting the given values in above equation, we get -
[tex]v = 2 + (1.5)*6\\= 2 + 9\\= 11[/tex] [tex]\frac{m}{s}\\[/tex]
The cart be traveling at a speed of [tex]11 \frac{m}{s}[/tex] by the time it reaches level ground.
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According to the cladogram shown, which two animal species shared the most recent common ancestor?
A. Primates and crocodiles
B. Birds and rodents
C. Sharks and birds
D. Birds and crocodiles
Answer:
The answer is D. Birds and crocodiles
Explanation:
They both share the same point which is their characteristic