the male reproductive system consists of external organs. while the female reproductive system consists of internal organs.
0. Alana mailed 6 letters in (3 different mailboxes. She
put the same number of letters in each mailbox.
How many letters did Alana put in each mailbox? 6 2×3
Answer:
Alana put mailed 2 letters in each of the 3 mailboxes
Explanation:
Alana put 2 letters in each of the 3 different mailboxes, dividing the total of 6 letters evenly.
Explanation:To answer how many letters Alana put in each mailbox, we divide the total number of letters by the number of mailboxes. Alana mailed 6 letters in total and used 3 different mailboxes. So, we perform the division 6 ÷ 3 to find the number of letters per mailbox.
6 ÷ 3 = 2 letters per mailbox.
Therefore, Alana put 2 letters in each of the three mailboxes.
Release of CFCs and similar compounds are a possible cause of
A destruction of ozone in the upper atmosphere
B greenhouse gas build-up in the lower atmosphere
C increase in atmospheric carbon dioxide concentration
D acid rain in the northeast U.S.
Release of CFCs and similar compounds are a possible cause of destruction of ozone in the upper atmosphere. The correct option is A.
What is ozone depletion?Ozone depletion is comprised up of two connected occurrences which basically have been located since the late 1970s: a continuous drop in ozone levels of roughly 4%.
Also the substantially bigger springtime decrease in stratospheric ozone over Earth's poles. The ozone hole is the name implies to the latter phenomena.
The primary factor for the ozone layer to thin out is chlorofluorocarbons, or CFCs.
Solvents, spray aerosols, refrigerators, air conditioners, and other appliances all release these.
UV rays degrade the chlorofluorocarbon molecules in the stratosphere and release chlorine atoms as a result.
Thus, the correct option is A.
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what is negative seven divided by four
Explanation:
The answer of -7/4 is equal to -1.75
HURRY ON A ASSIGNMENT I WILL GIVE BRAINLIEST CHECK ALL THAT APPLY
IT IS A B AND D ANSWER IT AND ILL STILL MARK BRAINLIEST :^)
At the beginning of Day 1, there were one hundred of each color bean. Twenty of the dark red beans and thirty-five of the light red beans were eaten. What effect will this have on the population of the beans? Check all that apply.
There will be more dark red kidney bean survivors.
There will be fewer light red kidney bean survivors.
There will be more light red kidney bean offspring the next morning.
There will be more dark red kidney bean offspring the next morning.
There will be an even number of light red and dark red kidney bean offspring produced that night.
This is is referred to as evolution by natural selection.
Explanation:
According to the question, more light red beans are eaten everyday compared to dark red beans. Therefore there are higher chances of dark red beans reaching reproductive age than light red beans. Consequnetly, dark red beans are more likely to pass down their genes to next generation than light red beans. Over subsequent generations will have more and more darker red beans and the population will, therefore, evolve towards higher dark red color allelic frequencies.
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Answer:
There will be more dark red kidney bean survivors.
There will be fewer light red kidney bean survivors.
There will be more dark red kidney bean offspring the next morning.
the economist thomas malthus suggested that
A people die faster than babies are born
B there were soon be insufficient food for the growing human population
C in the 1700s, England needed more housing
D the majority of a species offspring die
Answer:B there were soon be insufficient food for the growing human populatio
The economist thomas malthus suggested that there would soon be insufficient food for the growing human population. The correct option is B
What is Malthusian theory ?
In his essay "An Essay on the Principle of Population" from 1798, English economist and demographer Thomas Malthus predicted that population increase would eventually outpace the supply of resources, particularly food. He stated that although the production of resources and food only develops arithmetically (linearly), the growth of the human population is geometric (exponentially).
Therefore, He anticipated that unregulated population increase would result in resource shortages and overpopulation, which would cause poverty, starvation, and other societal problems. The "Malthusian theory" is the name given to Malthus' population theory, which has been the subject of dispute and discussion ever since.
Therefore, (Option B) is correct.
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Explain how one or more of the parts of and animal cell help to carry out homeostasis?
Answer:
The cell membrane is semi permeable which allows for diffusion of substances in and out of the cell. Most notably is osmosis across the cell membrane to maintain the osmotic pressure within the cell for the cell to maintain its structural integrity.
Explanation:
The Arizona poppy is a plant that is native to the Southwestern United States. Its orange flower blooms in the summer and the plant is covered in small hairs. It is an important part of an ecosystem because at least 46 different species of insects visit the flower for food.
As an Arizona poppy plant carries out photosynthesis, which of the following would not occur during stage 1 of the process?
A. Chlorophyll absorbs light energy.
B. Oxygen is released as a waste.
C. Water splits into hydrogen and oxygen.
D. Carbon dioxide is used to make glucose.
The process of making food by utilizing solar energy and inorganic reactant from the surrounding environment is called photosynthesis. The plants capable of photosynthesizing produces energy and food along with oxygen molecules.
The oxygen is not released as waste.
What is the reaction of photosynthesis?The plants have green coloured pigments called Chlorophyll in their cell organelle called chloroplast that absorbs the energy from the sun and also, the carbon dioxide and water from the surrounding area taken by the plants.The reactants carbon dioxide is utilized to generate glucose or the energy molecule and the water splits to produce the hydrogen needed in the chemical process and oxygen for the respiratory process.Therefore, option B. will not occur during stage 1 of the process.
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Which of these is an advantage of using natural gas?
A. It releases chemicals that become acid rain.
B. It is fairly safe for use in homes.
C. Equipment failure and human error can lead to gas leaks.
D. Scrubbers can be installed to reduce air pollution.
SUBMIT
Answer:
An advantage of using natural gas
It is fairly safe for use in homes.
Explanation:
They are cheap ,plentifully available throughout the world. It is has multiple uses such as cooking, heating, drying and also for industrial use. It can be used for power generation. Through it plastics, paints and fertilisers can be made. This is the cheapest source for the production of hydrogen. It can easily be shifted from the power plants to the residential areas. It leave any gaseous waste rather not polluting the underground water.
Natural gas advantage is it is fairly safe for use in homes. So option (b) is correct.
Modern technology and strict regulations ensure that natural gas appliances and infrastructure are designed with numerous safety features, making it a reliable energy source for cooking, heating, and other household uses.
This sets it apart from other options listed, such as releasing chemicals that become acid rain (A), the potential for gas leaks due to equipment failure or human error (C), and the installation of scrubbers to reduce pollution (D), which are not advantages but rather challenges or mitigation measures related to its use.
Overall, the safety and reliability of natural gas in home environments make it a favorable choice for many consumers.
A researcher and students wants to study the effectiveness of a new cancer drug. To do this, they plan on injecting rats with cancerous cells and then administering the drug to half and administering a placebo to the other half. Their data will be stored electronically, and collaboration between the researcher and students will be done over e-mail. What are some of the ethical concerns regarding this study, and how can they remedy these issues?
The death of mice from cancer is an ethical issue, and the solution is to keep them alive through treatment.
One of the most serious ethical considerations would be the welfare of the rats used in the experiments. The rats could die after getting the malignant cells. If the new medicine fails to work, the animals may experience side effects before dying. This problem could be remedied by performing studies on tissue samples rather of animals.
The mice will die from cancer during this research, but it is vital for the growth of medical sciences and the discovery of medicines for the treatment of cancer and other severe diseases. The solution to this problem is to take specific steps to prevent the mice from dying while also conducting the research properly, allowing us to decide that the death of the mice during the experiment is an ethical concern.
Thus, The rats could die, which would raise ethical concerns.
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At about 3 months a human embryo's nervous system has about how many cells?
Answer:hundreds of cells
Explanation: the fusion of male and female gametes forms a zygote, during early development one single cell divides in to two after few hours from fertilization. it furthers the division into four and which are made up of sixteen cells that is other-wisely called MORULA at the end of the third day. The cells continues the division at the of ninth day to form a BLASTOCYST which contains hundreds of cells.
the blastocyst must be able to attach to the lining of uterine where it derives every nourishment to grow and survive, without this there would be loss of such pregnancy
What is an example of mechanical weathering by gravity
Answer:
Abrasion
Explanation:
Mechanical weathering is generally called physical weathering where rocks are broken down physically. It means that the rocks are broken down into smaller pieces but the rocks' composition (chemically) is not changed.
There are different ways that rocks can be broken into smaller pieces physically and gravity helps can also cause it.
Abrasion is an example of mechanical weathering where rocks bump into each other and cause the rocks to breakdown because of the force of bumping into each other. Gravity plays a role when it comes to rocks on the mountain side.
When a rock on top tumbles down the side of the mountain, it bumps into other rocks along the way. Gravity is at play here because it pulls the rock downwards, causing it to tumble.
Select the most correct statement regarding nucleus acids
Explanation:
Nucleic acids are the biopolymers, or small biomolecules, essential to all known forms of life. The term nucleic acid is the overall name for DNA and RNA. They are composed of nucleotides, which are the monomers made of three components: a 5-carbon sugar, a phosphate group and a nitrogenous base
Final answer:
Nucleic acids are acidic due to their phosphate groups which can release a proton ionized at physiological pH levels, making them essential for cellular functions.
Explanation:
The most correct statement regarding nucleic acids is that they are acidic compounds first discovered in the cell nucleus and later found in the cytoplasm, mitochondria, and chloroplasts. Nucleic acids are high molecular weight, nitrogenous organic compounds essential for the storage, transmission, and control of cellular activities. A nucleic acid is defined as a polynucleotide, which is a polymer chain consisting of thousands of nucleotide units. Each nucleotide is made up of a nucleoside and phosphoric acid.
An acid is a substance that releases hydrogen ions (H+) in a solution. A positively charged hydrogen ion is simply a proton, which is prone to participate in chemical reactions. Nucleic acids release a proton (H+) from their phosphate group that is ionized at physiological pH, contributing to their acidic properties. Strong acids ionize completely in solution, while weak acids do not ionize fully, with some hydrogen ions remaining bonded within a compound.
In essence, nucleic acids are considered acids because each phosphate group in the nucleotide has one acidic hydrogen atom that gets ionized at physiological pH levels, making these compounds acids in the biological context.
Which is the function of the enzyme DNA polymerase during replication?
A) bonds mRNA to original parent strand
B) bonds new nucleotides to parent strand
C) unwinds the replicated DNA strand
D) winds up the replicated DNA strand
Answer:
The correct option is B) bonds new nucleotides to parent strand
Explanation:
DNA replication is a process by which DNA replicates by a semi-conservative method. The DNA double helix unwinds from the place where replication has to occur. Each strand of the DNA serves as a template strand for producing a daughter strand.
The DNA polymerase adds nucleotides complementary to each parent strand. In this way, a daughter strand is generated from the parent strands. This method of replication is termed as the semi-conservative method for DNA replication.
DNA polymerase is a crucial enzyme in DNA replication, its main role being to bond new nucleotides to the parent strand, thereby creating a new, complementary strand of DNA.
Explanation:The function of the enzyme DNA polymerase during replication is to bond new nucleotides to the parent strand. The parent strand is the original DNA sequence, and DNA polymerase attaches the new nucleotides in a specific order to create a new strand of DNA, which is a complementary strand to the parent strand. This process ensures that the genetic information is accurately copied from one cell to another during cell division.
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Can we recreate the way caterpillars morph into a butterfly and then evolve other animals or maybe humans
The recreation can be done by the process of CRISPR-Cas9 editing of gene.
Explanation:
The gene editing process is executed by Whiteman and his co-workers of California University by transforming fruit flies into a poisonous species. The monarch butterflies were made to undergo the process of this mutation of gene and were made eat milkweed of toxic category.
Through this process 3 CRISPR were edited to one gene to make a monarch caterpillar to eat milkweed. He was influenced by the evolutionary war between plants and insects which thrive him to discover this process.
Which prevents speciation?
O
A. Adaptations
B. Mutations
C. Gene flow
D. Geographic isolation
SUBMIT
Answer:
i would say gene flow . because gene flow prevents reproductive isolation .
Answer: Gene Flow
Explanation:
what would be the most likely result if humans stopped burning fossil fuels?
A) the greenhouse effect would become stronger.
B) the sea levels would rise more quickly.
C) there would be less carbon dioxide in the atmosphere.
D) the planet would become much warmer.
Explanation:
C) there would be less carbon dioxide in the atmosphere.
An environment's biology includes both abiotic factors like atmosphere, water, soil, sunlight and temperature; and biotic factors which are living components of the ecosystem. These factors lead to a gradual change of an ecosystem over time; however, humans drastically impact the environment through over-exploitation and pollution- we disrupt normal abiotic and biotic interactions. Furthermore, human impact can lead to population die-offs and extinction events, along with food and water scarcity.
Humans impact on the environment can manifest as:
burning fossil fuels- this reduces air quality and adds carbon dioxide to the environment leading to global warming; pollution- adding contaminants to the atmosphere, waterways, soil etc. urban communities also expand by cutting down trees in deforestation- this leads to erosion and flooding;Learn more about ecological succession at brainly.com/question/2456852
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Answer:
there would be less carbon dioxide in the atmosphere
Explanation:
How does the first meiotic division differ from the second meiotic division in terms of what is separated in anaphase I and anaphase II?
Answer:
Meiosis can be described as a process of cell division in which four daughter cells are produced and the chromosome number in the daughter cells gets reduced to half of the parent chromosomes.
In anaphase 1, the homologue chromosomes are pulled apart and they get pulled in the opposite reaction. The sister chromatids are not separated in anaphase 1.
In anaphase 2, the sister chromatids get separated. They move towards the opposite pole.
2. Mercury (II) oxide decomposes into mercury and oxygen gas according to the following
skeletal equation.
2 H90 → 2 Hg+ L02
a) How many moles of mercury (II) oxide are needed to produce 125 g of oxygen?
To produce 125 g of oxygen, 250 moles of mercury (II) oxide are needed.
Explanation:To determine the number of moles of mercury (II) oxide needed to produce 125 g of oxygen, we need to use the molar ratio between mercury (II) oxide and oxygen. From the balanced equation, we can see that 2 moles of mercury (II) oxide produce 1 mole of oxygen. Therefore, we set up a proportion:
(2 moles HgO) / (1 mole O2) = (x moles HgO) / (125 g O2)
Then, we cross multiply and solve for x:
x moles HgO = (2 moles HgO / 1 mole O2) * (125 g O2)
After calculation, we find that x is equal to 250 moles of mercury (II) oxide.
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To produce 125 g of oxygen (O₂), you need 7.8125 moles of mercury(II) oxide (HgO). This calculation is based on the balanced chemical equation and the molar mass of O₂. Hence, 7.8125 moles of HgO are required.
To determine how many moles of mercury(II) oxide (HgO) are needed to produce 125 g of oxygen (O₂), we use the balanced chemical equation:
2 HgO → 2 Hg + O₂
Here are the steps:
First, find the molar mass of O₂:
O: 16 g/molMolar mass of O₂ = 2 × 16 g/mol = 32 g/molNext, we calculate the moles of oxygen gas (O₂ )
Moles of O₂ = 125 g ÷ 32 g/mol = 3.90625 molesAccording to the balanced equation, 1 mole of O₂ is formed from 2 moles of HgO.
Thus, moles of HgO needed = 2 × moles of O₂:Moles of HgO needed = 2 × 3.90625 = 7.8125 molesTherefore, 7.8125 moles of mercury(II) oxide are needed to produce 125 g of oxygen.
A biologist studying a desert ecosystem observes that the population of a lizard species increases following particularly hot, dry period that causes a snake population to decline. What could the biologist hypthesize about the roles of these two species?
A) The lizard preys on the snake
B) The lizard is a parasite of the snake
C) The snake and lizard use the same limiting resource
D) The snake is a keystone species in the ecosystem.
Answer:
B.
Explanation:
Same but different because lizards are very similar to snakes. Snake are just more vicious.
What is the answer plz ?
Answer:
18°
Explanation:
Remember this:
All angles inside a triangle sum up to 180°.
So in your case:
∠A + ∠B + ∠C = 180°
Now you need to solve for ∠A, but you need to know what x is first. So we solve for it by plugging in the expressions into one equation. Let's start with what is given:
∠A = x -22
∠B = 3x + 19
∠C = x - 17
So we plug use the given and put it into our first equation so we can solve for x:
∠A + ∠B + ∠C = 180°
(x - 22) + (3x + 19) + (x - 17) = 180°
[tex](x - 22) + (3x + 19) + (x - 17) = 180\\\\ Combine\;like\;terms\\\\5x - 20 = 180\\\\Add\;20\;to\;both\;sides\;of\;the\;equation\\\\5x - 20 + 20 = 180 + 20\\\\5x = 200\\\\Divide\;both\;sides\;by\;5\\\\\dfrac{5x}{5}=\dfrac{200}{5}\\\\x = 40[/tex]
Now that we know that x = 40, we substitute that into the equation of ∠A.
∠A = x -22
∠A = 40 -22
∠A = 18°
Why does the first sentence state that carbon is the backbone of life on Earth?
Question 1 options:
Bones are made of carbon.
All life on Earth needs carbon.
Earth is made only of carbon.
Animals breathe in carbon.
Air pollution is caused by A. the sun. B. heavy rainfall. C. human activities but not natural events. D. natural events and human activities.
Answer:
D . natural events and human activity
PLEASE HELP ME I'M LITERALLY GONNA CRY IF I GET THIS WRONG
A student adds a suspension of baker's yeast cells into bread dough. When this mixture is left in a large bowl undisturbed for several hours, the student returns to find that the bread dough has doubled in size. What gas molecule is responsible for this increase in dough size?
A. O2
B. N2
C. H2
D. CO2
Answer:
D. CO2 - Carbon(iv)oxide or carbondiooxide
Explanation:
Since CO2 is a product and not a reactant, the higher the temperature, the higher the rate of cellular respiration.
Describe how the water vascular system plays a role in feeding.
Answer:
The water vascular system of echinoderms is essentially a system of fluid-filled canals that extend along each of the body regions and have many external projections called tube feet. There are several functions of the system, one of which is to use water pressure to mediate movement and assist in feeding. ... Stone canal.
Final answer:
The water vascular system in echinoderms is essential for feeding as it uses hydrostatic pressure to extend and retract tube feet, enabling the organism to capture and handle prey. This system also aids in nutrient circulation and gas exchange.
Explanation:
Role of the Water Vascular System in Feeding
Echinoderms possess a distinctive water vascular system which plays a crucial role in the organism's feeding behavior. This system comprises a network of canals and tube feet that project through the skeleton of the creature. During feeding, the tube feet are employed to capture prey through suction, thanks to their ability to expand and contract using the hydrostatic pressure within the system.
The water vascular system allows echinoderms to maneuver prey into place and assist in the handling and transport of food to the mouth. Water enters through the madreporite, passes to the ring canal, and then through the radial canals, powering the tube feet for the execution of feeding activities. The system also facilitates nutrient circulation and gas exchange, vital processes for the echinoderm's survival.
Overall, the water vascular system's ability to create hydrostatic pressure enables echinoderms not only to locomote and engage in prey manipulation but also significantly contributes to their potential to feed effectively in their aquatic ecological niches.
Why are igneous rocks the best type of rock sample for radiometric dating
Answer:
Because igneous Rock is separated into different minerals. Radio carbon dating works by measuring the amount of carbon dioxide.
Due to the diverse minerals that are extracted from igneous rock. The process of radio carbon dating involves counting the amount of carbon dioxide.
What is radiometric dating?The best sorts of rocks samples to utilize for radiometric dating are igneous rocks. Elements are divided up into various minerals in the rock during the formation of igneous rock.
When minute quantities of radioactive impurities are created, they can be selectively integrated into materials like rocks and carbon, which is how radiometric dating, radio dating, or radioisotope dating is used to date them.
Therefore, when minerals in igneous rocks first develop, they frequently only contain the parent isotope and none of the daughter isotope.
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Which statement shows an example of how human activities can directly change the equilibrium of an ecosystem? A. A cold front moving in causes increased winds which increases water evaporation from plants. B. A hurricane causes a river to overflow its banks. C. Water pollution causes a decrease in the fish population of a lake. D. The ozone layer helps prevent harmful radiation from reaching the surface of Earth.
Answer:
c water paultion or d
jnj
Explanation:
The statement shows an example of human activities that can change the equilibrium of the situation where a cold front moving in causes increased winds which increases water evaporation from plants.
What is equilibrium ?It is defined as the state where a balance is created where a state of older is in equilibrium with the newer state that is the reactant state is getting into product site and the product site is just getting formed.
A cold front that is the colder edge where the leading edge of the colder mass that replaces the warmer air and compression on the outer edge thus these states makes a havoc in the ecosystem and automatically disturbs the equilibrium of the ecosystem.
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GETS BRAINILIST!!!A __________ is a large area of thick ice that moves slowly. coastline delta dune glacier
bruh that is a glacier right
Answer:
Glacier
Explanation:
If shell fragments are found in a rock sample, it is most likely
that the rock formed
a) on a mountian slope
c) from magma
b) on a glacier
d) in shallow water
Answer:
D
Explanation:
Shell fragments on a rock are usually results of shallow water.
1. Photosynthesis and cellular respiration are often described in two ways: (1) They are chemically opposite; and (2) They have a relationship to each other. Explain what these two statements mean. Be sure to include the specific substances used and released by each process.
Answer:
Photosynthesis and cellular respiration are chemically opposite. The reactants of photosynthesis are energy, carbon dioxide (6CO2), and water (6H2O). The products of cellular respiration are energy, carbon dioxide, and water. The products of photosynthesis are glucose (C6H12O6) and oxygen (6O2), and the reactants of cellular respiration are glucose (C6H12O6) and oxygen (6O2). So, the processes' equations are chemically opposite. The relationship between photosynthesis and cellular respiration is such that the products of one system are the reactants of the other. Without photosynthesis, cellular respiration couldn't take place, and without cellular respiration, photosynthesis couldn't take place. It's like a cycle.
Explanation:
Photosynthesis and cellular respiration are often described in two ways: (1) They are chemically opposite; and (2) They have a relationship to each other. One is anabolic and one is catabolic.
What is photosynthesis ?It is the process by which plants prepare their food in the presence of sunlight with the use of water, carbon dioxide and this makes the glucose along with the release of energy.
Photosynthesis is the process in which the carbon dioxide along with water and sunlight binds up together in order to form glucose or the energy source that is the produced byproduct of photosynthesis.
Cellular respiration is the catabolic process where the carbon dioxide along with the water molecules break into energy. The product of cellular respiration is carbon dioxide and water with the formation of ATP,NADPH.
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The planet
has a diameter that is larger than the diameter of Mars but smaller than the diameter of Neptune.
A.Venus
B. Mercury
C. Saturn
D. Jupiter
Answer:
a venus it is similar size to earth and earth matches this description