How can plastics in the ocean impact human health? plastics in the ocean have no impact on human health, as the plastics only impact ocean organisms. plastics in the ocean are harmful to ocean organisms but are generally not harmful to human health. plastics in the ocean are not harmful to the ocean or ocean organisms, so there would be no impact on human health. plastics in the ocean are harmful to ocean organisms and human health when people consume ocean organisms.

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.

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