Which of these best describes air pressure? a
b
amount of pressure exerted in the atmosphere due to the movement of earth
amount of pressure exerted by dust particles in the atmosphere
amount of pressure caused by volcanoes and wildfires in the atmosphere
amount of pressure in the air caused by gravity and matter moving on all objects
h
Od
Question 2 (1 point)

it would be (d) amount of pressure in the air caused by gravity and matter moving on all objects

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:

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).   so the answer is a.