Question

The overall population of a species decreased. What could have occurred to make this happen?
The immigration rate increased, while the death rate decreased.
The birth rate decreased, while the death rate increased.
The carrying capacity increased, while the immigration increased.
The emigration increased, while the birth rate increased.

Answer 1

Well this shouldn't be that hard to do. If the population of a species decreases.. Then it's becoming smaller. Therefore there could be less reproducing happening, as well as higher death rates. Reproducing would more than likely cause a higher population or regulate it.