What’s the answer for this too? Please help me

Which of the following is the main purpose of a human community?

Migration is a. the movement of organisms from a native location to a foreign location b. the movement of organisms from a foreign location to a native location the movement of organisms from their water supply to their food supply d. the seasonal movement of organisms between locations c. select the best answer from above

Give an example of a trait that is controlled by more than one gene.