I'd like some answers if possible

Atoms are made up of even smaller particles called Molecules

Atoms are made up of even small atoms called electrons ,protons ,neutrons

the electrons are the green circles

the protons are the blue circles

the neutrons is the yellow circles ♌

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:

i believe it would cause an increase of percipitation, though i could be wrong. so i would say b is the answer.