Answer:
4.6 billion years old
Radioactive dating
Explanation:
The age of the earth is 4.6 billion years and scientist used radioactive dating to determine the Earth’s age.
Radioactive dating:
It is a technique by which the age of the old rocks and fossils are determine. Radioactive substance decays with time.
Since, radioactive substances are present every where. So, the scientist utilize this property to determine the age of the Earth.
Therefore, the age of the earth is 4.6 billion years and scientist used radioactive dating to determine the Earth’s age.
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What type of bonding is responsible for water's' ability to absorb some much heat?
The type of bonding responsible is Hydrogen Bonding
Hope that helps!!
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which layer of earth acts as a very effective “insulator,” because it’s made of rock? Mantle crust outer core inner core
Correct answer: Mantle
Earth is composed of three layer called as crust, mantle,core. Crust is the outer layer of the earth and mantle is the middle layer and core is known as the inner layer of the earth surface.
Mantle is a layer which found in between the crust and core, it is made up of silicate rocky shell with a thickness of 2886 kilometers. It covers the 84% of the earth's volume.
The mantle layer of earth encompasses core layer of the earth which is made up of iron and nickel which covers 15% of the earth's volume. Mantle layer of the earth trap the heat which is being generated inside the core layer of the earth and act as a insulator.
Earlier in the passage this question was provided for, you should be able to find the fallowing text: "The mantle, being made of rock, acts as a very effective insulator."
Answer: Mantle
What definition best describes polygenic traits?
Polygenic traits are controlled by two or more than two genes (usually by many different genes) at different loci on different chromosomes. These genes are described as polygenes . A polygene refers to a group of genes that when expressed together produce a particular phenotype or trait.
Answer:
letter b
Explanation:
+50 pts How can you tell that algae filaments are composed of several cells rather than just one?
Non-scientific method:
Well, an easy way is observing the filament under a microscope: if it contains one cell it's unicellular and if it contains more than one cell it's multicellular.
Scientific method:
Filamentous algae are, in principle, single-celled. But, sometimes they can form colonies and evolve to be multicellular. But still, if they just form a colony they'll still be unicellular until they start changing.
Answer:
Unicellular.
Hope it helped,
BioTeacher101
How do animals return water to their environment from their bodies?
Animals excrete water by respiration and by passing urine.
What organelle functions primarily in the synthesis of protein
Help Asap Please!!!! WILL MARK BRAINLIEST
Eye color is a polygenetic trait that involves multiple genes and alleles. How many genes and alleles are involved in determining eye color?
1.
4 genes and 8 alleles
2.
8 genes and 4 alleles
3.
1 gene and 1 allele
4.
2 genes and 2 alleles
Photos (left to right) by Mehmet Karatay, Jens Buurgaard Nielsen, Furryscaly, and Walter Siegmund
What would occur if the snake population is removed from the ecosystem pictured above?
the hawk population increases
the mouse population increases
the leaf population increases
the mouse population is not affected
The mouse population increases. Snakes eat mice, so fewer snakes would mean more mice.
b.the mouse population increases
_____ increases the frequency of adaptive mutations in a population over time a. Fitness b. Natural selection c. Artificial selection d. Adaptive radiation
In which two ways can scientists exhibit ethical behavior?
1 cleaning their labs regularly to boost hygiene
2 creating products that improve people’s lives
3 eating and drinking only during breaks
4 using only data that supports their hypothesis
5 remaining impartial about data while conducting experiments
Answer:
2. Creating products that improves people's lives.
5. Remaining impartial about data while conducting experiment.
Explanation:
Scientists are required to perform ethical practices during their tenure of research which does not include any bias, manipulation in observations and the research product can be used for the wellness of the society.
Among the options given, the following are correct options:
2. Creating products that improves people's lives.: The ethical practice of research should aim to provide benefit to the society rather than sceintists obtaining their own benefit.
5. Remaining impartial about data while conducting experiment.: Manipulated and biased observations should not be included in the data used for obtaining and describing the results. It is against the research ethics.
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A botanist discovers a plant growing in her yard. It does not have leaves or roots, but it does have vascular tissue There are yellow sporangia growing on the green, branching stems. Which of the following is the most logical conclusion about the classification of this plant?
It is a whisk fern, and belongs to the phylum Psilophyta.
It is a liverwort, and belongs to the phylum Hepatophyta.
It is a hornwort, and belongs to the phylum Anthocerophyta.
It is a horsetail, and belongs to the phylum Sphenophyta.
Answer:
The correct answer would be - whisk fern that belongs to the phylum psilophyta.
Explanation:
The whisk fern belongs to the division psilophyta. It is the lower vascular fern or primitive fern. It has vascular tissue or water conducting tissue but they lack true leaves and roots.
The water mineral absorption occurs or initiates in the root like stem called rhizome. Photosynthesis process takes place in the aerial part of the plant. Rhizome receives water from fungus through a mycorrhizal association.
Thus, the correct answer is option C.
From the Bohr Model diagram, assuming the atom is neutral, what element is represented by the diagram?
diagram for hydrogen
Answer:
Hydrogen
Explanation:
Bohr Model: In this model negatively charged electrons orbits a positively charged nucleus like the planets orbiting around the sun. Coulomb force between the negatively charged electrons and positively charged nucleus is mathematically akin to the gravitational force of the solar system. Important points are-
The electrons orbit the nucleus in the orbits that have a set energy and size. Orbital energy is related to its size, highest energy is found in the largest orbit.The radiation is emitted or absorbed during the movement of electrons from one orbit to the other.Bohr Model of Hydrogen :
The example of hydrogen atom is simplest in case of Bohr model or for a hydrogen-like ion in which the electrons which is negatively charged orbits around a positively charged nucleus. Only certain electron orbits are allowed and radius of the orbit increases square of n, where n is the principal quantum number. The first line of Balmer series is produced in the 3 to 2 transition. For hydrogen, z=1, this produces a photon of wavelength 656 nanometer.
This chart shows a portion of a dichotomous key.dichotomous keywhich relationship can be determined from this dichotomous key?organism x and organism z have at least one observable trait in common.organism y has at least one observable trait in common with organisms x or z.organism x is in a different phylum than organism y.organism z is genetically closer to organism x than to organism y.
Why are populations with high levels of genetic diversity more stable than populations with low levels of genetic diversity?
A. Populations with high levels of genetic diversity are more likely to have individuals with traits that help them survive if conditions change.
B. Populations with high levels of genetic diversity are less likely to interbreed with other populations.
C. Populations with high levels of genetic diversity are less likely to have high levels of variation in alleles.
D. Populations with high levels of genetic diversity are more likely to have individuals that will undergo natural selection if conditions change.
A. Populations with high levels of genetic diversity are more likely to have individuals with traits that help them survive if conditions change.
Populations with high levels of genetic diversity are more likely to have individuals with traits that help them survive if conditions change. The correct option is A.
What is genetic diversity?The range of different inherited traits within a species is referred to as genetic diversity.
There probably be various individuals with a wide range of different traits in a species with high genetic diversity. For a population to adapt to changing environments, genetic diversity is essential.
Genetic diversity allows populations to adapt to changing environments. More variation increases the likelihood that some individuals in a population will have allele variations that are suited to the environment.
Those people are more likely to survive and have children with that allele.
Individuals with traits that help them survive if conditions change are more likely to exist in populations with high levels of genetic diversity.
Thus, the correct option is A.
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Samantha hypothesized that tomatoes grow best at 25°C. To test her hypothesis, she designed ten different growth chambers that were each controlled for a specific temperature. Then, she placed ten tomato plants in each chamber and recorded the number of tomatoes produced after 2 months. She graphed the average number of tomatoes grown per plant for each temperature. What can the student conclude about her hypothesis based on the results? A. The results disprove her hypothesis. B. The results support and prove her hypothesis. C. The results do not support her hypothesis but do not disprove it. D. The results only support her hypothesis.
D.The results only support her hypothesis
is there any other info?
The correct answer is D. The results only support her hypothesis. I just answered this question on study island and this is the correct answer.
How are streams and rivers in drainage basins affected by converting prairie land to farm land?
The streams and rivers in the drainage basins were the prairies are converted into farm land are mostly affected by the agriculture and its needs, as well as its consequences.
The agriculture demands water for irrigation, and most of this water comes from the streams and rivers, so that contributes to lowering of the water levels of the streams and rivers.
The agriculture also causes damage to the streams and rivers by polluting them. Namely, the pesticides, herbicides, and fungicides that are used for protection of the plants, partially end up in the low groundwater's, and in general, these waters are connected to the streams and rivers, so the pollutants end up in them, and that affects the biodiversity in them very badly.
Answer:
it d
Explanation:
Choose all the answers that apply.
The hypothalamus _____.
A. is part of the pituitary gland
B. regulates temperature and metabolism
C. is the control center for the endocrine system
D. links the endocrine and nervous systems
E. controls homeostatic responses
Answer:A,B,D,E
Explanation:
The hypothalamus is part of the pituitary gland, regulates temperature and metabolism, links the endocrine and nervous systems and controls homeostatic responses. Thus, the correct option is B.
What is pituitary gland?Pituitary gland is defined as a small, pea sized endocrine gland located at the base of brain below hypothalamus.
It releases several important hormones and controls the function of many other endocrine system glands.
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Water is ___ transported into and out of the vacuoles in the guard cells.
Water is H2o
Covalent compound (O,H are nonmetals)
Valence of O (O must form an octet): 6
Valence of H: 1
Total valence electrons: 8
Molar mass: 18.02 g/mol
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For survival a hummingbird uses a considerable amount of energy . This energy most directly results from the life activity of ?
This energy most directly results from the life activity of respiration.
The hummingbirds have very high energy expenditure (have the highest oxygen requirements of all vertebrae) with a fast heart rate, very fast wing beats and sustained hovering. So the hummingbird is nearly always on the edge of starvation, needing to take in more nectar than its body weight each day.
The respiratory system of these birds is highly adapted for the high oxygen needs. So, the muscles of the hummingbird cause pressure changes within the air sacs. As a result, more oxygen can enter the respiratory system. Also, they have the highest density of red blood cells which allows them to rise heart beat to around 500 breaths per minute during flight.
Answer: Cellular respiration
Explanation:
The process by which the living organism derive energy for the various metabolic processes of the body is known as cellular respiration.
This process allows the body to obtain energy from the food that they eat. Humming bird usually feeds on the nectar of flowers as a source of energy.
The cellular respiration is the process by which this food will be transformed into adenosine triphosphate which is a high energy molecule required for various processes of the body.
Which of the organelles below were observable under high power? Check all the organelles that you could see.
-Cell Membrane
-Nucleus
-Vacuoles
-Ribosomes
Answer:
FOR HIGH POWER: CELL MEMBRANE & NUCLEUS
LOW POWER: CELL MEMBRANE
Explanation:
The organelles observable under high power are the cell membrane, nucleus, and ribosomes.
Explanation:The organelles that were observable under high power are the cell membrane, nucleus, and ribosomes. Vacuoles cannot be observed under high power because they are too small to be seen with a light microscope.
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You must turn off the engine to stop CNG flow. A) True B) False
A) True
Explanation:To avoid these hazards, technicians must turn off the engine to stop CNG flow – especially before working on the vehicle. Most CNG vehicles have several ways of turning off the engine, so check the manufacturer's specific directions. Automatic release valve - installed on newer CNG systems.
Answer: True
Explanation:
CNG vehicles present potential hazards which include:
• Ignition sources as the ignition temperature is twice as high as gasoline.
• Contact with fuel
• Asphyxiation
• High-pressure CNG line
To avoid any of these hazards, you must turn off the engine to stop CNG flow and there are many ways by which you can turn it off.
Describe Henrietta Leavitt's discovery, and explain why it was so important in the society in which she lived.
Henrietta Swan Leavitt discovered cepheids in 1908 during the investigation of different stars in the clouds. She published it by working more on it in 1912 and died in December 1921. This discovery was so important in the society in which she lived because the cosmologist of America was known for this discovery of Cepheids which is a relationship between period, luminosity and quivering stars which changes in light.
Which of the following is a TRUE statement?
A) Fats contain half the amount of energy than carbohydrates because they have less bonds.
B) Carbohydrates contain more energy than lipids because their bonds release more energy when broken.
C) Lipids contain more energy than carbohydrates because they contain more carbon to hydrogen bonds to release energy when broken.
Answer: Option C
Explanation:
The energy that is required by the body is primarily stored in the form carbohydrates. The energy from the carbohydrates is easily converted into a usable form which is adenosine triphosphate.
The energy from the carbohydrates can be derived easily but from lipids it is difficult. Lipids contain more energy than carbohydrates because they contain more carbon to hydrogen bonds and when these bonds are broken down they release energy.
This energy is much more than carbohydrates. Hence, the maximum energy in the molecules is in lipids.
Why is the human cardiovascular system considered closed?
Answer:
There are no holes for blood to enter or leave the system
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How many unique zygotes can a couple make?
You can only make one zygote but in some cases the egg splits and makes an identical twin.
Final answer:
A couple can potentially produce over 64 trillion unique zygotes due to the combination of meiotic genetic recombination, random fertilization, and occasional occurrences of twins, both dizygotic and monozygotic.
Explanation:
The number of unique zygotes that a couple can produce is astonishingly high due to the genetic variability involved in sexual reproduction. Each human zygote contains a unique set of 46 chromosomes, with 23 inherited from each parent. This genetic diversity arises from the process of meiosis during gamete formation, where chromosomes are shuffled and recombined. Additionally, random fertilization further increases genetic variability.
While most often a single egg is released and fertilized, resulting in a unique zygote for each pregnancy, there are cases such as dizygotic twins where two eggs are released and fertilized by two different sperm, resulting in two genetically distinct zygotes. Furthermore, unique scenarios can lead to monozygotic twins, where a single zygote divides to form genetically identical offspring. However, when considering the number of potential unique children a couple can produce without considering twins, the estimated number of genetically unique zygotes is over 64 trillion, showcasing the vast potential for genetic diversity.
THE national average or per capital ecological footprint is equal to a nations ecological footprint divided by its population. All but one tactic will help reduce our national average
Answer:
D. Drink water from plastic bottles.
Explanation:
Was on USATestPrep
Match each enzyme with its correct function.
1.
ligases
2.
hydrolases
3.
proteases
4.
cellulases
5.
lipases
a.
generalized enzymes involved in digesting foods
b.
facilitate the joining of two substrates
c.
break down fats
d.
break down proteins such as meats, nuts, eggs, and cheese
e.
contained by plants to break down fiber
Scientists have evidence that the Antarctic Bottom Water is becoming fresher and warmer. What are two changes that could happen as a result of this?
This would be because of the melting of icebergs, ice is made of fresh water, that means the water increases in freshness because of the increasing amount of ice melting. It is getting warmer most likely because of global warming, which also contributes to the melting of glaciers
Answer:
This would be because of the melting of icebergs, ice is made of fresh water, that means the water increases in freshness because of the increasing amount of ice melting. It is getting warmer most likely because of global warming, which also contributes to the melting of glaciers
What statement holds true for the amount of matter in a successful food web? A) Amount of matter contained in the producers and consumers should be equal. B) Amount of matter produced by the producers should be more than that of the consumers. C) Amount of matter contained in the consumers should be more than that of the producers. D) Amount of matter produced by the producers should be negligible when compared to the consumers.
Answer: B. Amount of matter produced by the producers should be more than that of the consumers.
Food web defines a interconnection between different food chains and transfer of energy at each trophic level. According to the ten percent law 10% energy is lost from each trophic level. At the first trophic level there are producers. Producers occupy the only one level in the trophic levels the rest is occupied by consumers this shows the category of consumer is more than producer. Therefore, for successful food web food availability should be more at initial trophic level hence amount of matter produced by the producers should be more than that of the consumer.
Amount of matter produced by the producers should be more than that of the consumers because matter and energy are lost with each successive step of the food chain. Therefore, for a food web to be functional and successful, the total amount matter produced by the producers be more than that of the consumers they support.
What does the D in DNA Stand for?
A. The name of the base that makes it up
B. The kind of macromolecule it is
C. The name of the sugar that makes it up
D. The number of strands that form it
The answer is (C) as the name of sugar that makes it up.
ExplanationDNA stands for Deoxyribose Nucleic Acid. Deoxyribose is a five carbon (pentose) sugar. Name deoxy is given to it because of containing one oxygen less than ribose. It's formed by replacing the hydroxyl group (OH) with hydrogen (H) at carbon number 2. In DNA structure Deoxyribose molecule is attached to the next phosphate molecule with the help of phosphodiester bonds.
DNA stands for Deoxyribose Nucleic Acid. Deoxyribose is a five carbon (pentose) sugar. Name deoxy is given to it because of containing one oxygen less than ribose. Thus, the correct option is C.
DNA is formed by replacing the hydroxyl group (OH) with hydrogen (H) at carbon number 2. In DNA structure Deoxyribose molecule is attached to the next phosphate molecule with the help of phosphodiester bonds.
DNA is a hereditary material which is present in human beings as well as all other living organisms. Every cell which is present in an organism's body has DNA which is the same. Most of the DNA is situated in the cell's nucleus and small amount of it can be found in the cell's mitochondria as well.
Information which is stored in DNA is stored as codes made up of four chemical bases namely, adenine, thymine , cytosine and guanine.Human DNA consists of 3 billion bases .The order of the bases determines information which is required for building and maintaining an organism.Thus, the correct option is C.
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