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liraira [26]
3 years ago
5

Natural selection causes A. changes in allele frequencies within a population. B. changes in the mechanism of inheritance. C. th

e inheritance of acquired characteristics. D. a decrease in reproductive fitness in a population. E. changes in an individual's genes.
Biology
1 answer:
wolverine [178]3 years ago
4 0

Answer:

Natural selection causes change in allele frequencies within a population.          

So option A is correct one.

Explanation:

Natural selection generally  work  on an organism’s phenotype, or observable features. Phenotype is often largely a product of genotype (the alleles, or gene versions, the organism carries). When a phenotype produced by certain alleles helps organisms survive and reproduce better than their peers, natural selection can increase the frequency of the helpful alleles from one generation to the next – that is, it can cause microevolution.

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Answer:

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Explanation:

Troposphere (0 to 12 km) where we live is the lowest layer of earth's atmosphere, which is closest to the earth's surface contains half of the atmosphere. Here most clouds are found and almost all weather occurs. Atmosphere contains approximately 78% of nitrogen , 21% of oxygen and 0.9% of argon. Gases like carbon dioxide, nitrous oxides, methane, ozone and the water vapor constitutes the rest of the atmosphere. Many small particles called aerosols are also there which include dust, spores, pollen, volcanic ash, smoke etc.The greenhouse effect is a natural phenomenon that keeps the temperature on the earth suitable for supporting life. The greenhouse gases includes both natural and man-made gases like carbon dioxide , methane, nitrous oxide, chlorofluorocarbons, hydrochlorofluorocarbons, ozone, water vapour. They absorb radiation in the atmosphere and create the green house effect. The thermal infrared radiation emitted by the Earth’s surface and the atmosphere is absorbed by greenhouse gases. They trap heat within the surface-troposphere system preventing it from escaping back into space. This is called the greenhouse effect, which increases the temperature of the lower atmosphere.The increase in the atmospheric concentrations of greenhouse gases due to human activity has caused an increase in the natural greenhouse effect. As a result, the atmosphere is trapping too much heat which increases the temperature of the Earth.

7 0
3 years ago
Fossil fuels are the compressed remains of ancient organisms like plants or dinosaurs. they cannot be recycled. once they are us
Tju [1.3M]
B is the answer because the rest of them u can get back but not coal
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3 years ago
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Anestetic [448]
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What is a major difference between DNA polymerase I and DNA polymerase III?
notsponge [240]

Answer:

(B) DNA polymerase I synthesizes DNA on lagging strands and DNA polymerase III synthesizes DNA on leading strands

Explanation:

Both the enzymes DNA polymerase I and DNA polymerase III involved in the process of DNA Replication with specialised functions. DNA polymerase I synthesize DNA on lagging strand where it degrades RNA primer and replace it with DNA. On the other hand, DNA polymerase III synthesize DNA from 5' to 3' end on the leading and lagging strand but stops at the RNA Primer.

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Molecules that have a slightly positive and slightly negative region are known as
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They are known as polar molecules. For example, water has regions varying in electric charge. Therefore, its one end is positively charged, and another end is negatively charged. 
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