Answer:
Migration is the movement of individual organisms into, or out of, a population. ... Immigration is the movement of individuals into a population from other areas. This increases the population size and growth rate. Emigration is the movement of individuals out of a population.
Explanation:
A. Add up individuals who came into the area because of reproduction or immigration
Doldrums are caused by solar radiation from the sun. Because of this the sunlight beams warms the air and causes it to rise straight up instead of side to side (horizontally).
I belive that the answer is A
