What is one biotic factor that affects the size of a population in an ecosystem?

a) local geography

b) number of predators present

c) average yearly temperature

d) average yearly precipitation

Biotic means from a living things, and stuff like rain isn't living. That means the answer is B, because predators are the only living thing.

It might. it might because if you think about if they discovered if we came from (lets say something funny like aliens) and thy found cells that matched and they would have t do more research about it but would most probably change their theory.