Two students describe natural selection to their classmates. Student 1 describes that individuals are able to evolve to fit their changing environment and thus result in populations that are well adapted over time. Student 2 proposes that natural selection
occurs when selective pressures act on individuals but evolution affects whole populations. Which student should refine their
explanation of natural selection and why?

Student one should refine their answer because it implies that individuals can evolve within their own life. Evolution is a process that take thousands and even millions of years and will affect an entire population. One individual will not be able to evolve in a single lifetime.

Explanation:

1) gene flow

- it is described as the transfer of genes from one population to another population so that frequency of gene is increased.

-a zebra migrates to join a different herd of zebras.

2) natural selection

- a mechanism of evolutionary change in which individuals with advantageous traits survive and reproduce whereas the others ( those that can not adapt) eliminate from the population.

-competition for sunlight leads to taller trees.

3) mutation

- permanent change in the nucleotide sequence of dna ( genetic material) that could have harmful or useful consequences.

-the dna of a snake changes to make its venom stronger.

4) genetic drift - it is a random phenomenon ( that occurs by chance such as fire) that results in change in the gene frequency in a small population.    

-a grassfire randomly sweeps through a population of buffalo and kills most of the animals.

explanation:

equal distribution i think.