You are presented with the question "Gene flow occurs when individuals move into or out of a subset of a what?" and the following answer choices: 
- animals
 - mammals
 - humans
 - plants
 - goats
 - offspring
 - Species
 - alleles

Now knowing that gene flow occurs when individuals move into or out of a population and populations Populations are subsets of a species, choose the best answer.


 

       Species  