Answer:
The answer is a) gene flow
Explanation:
Gene flow is any displacement of genes from one population to another. The gene flow includes a multitude of different types of events, such as pollen that is transported by air to a new destination or people who move to another city or another country. If genes are transported to a population where those genes did not exist, gene flow can be a very important source of genetic variability.
I think its A i hope that helps
The immune and lymphatic systems work to protect and fight pathogens
Your answer is:
DDT
is a pesticide that influenced society by increasing crop yield, but it also caused human and animal sickness.
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