Ahurricane hits a small island, killing all but a few members of a bird population. this is an example of

A hurricane hits a small island, killing all but a few members of a bird population. This is an example of population bottleneck effect. The bottleneck effect is a sudden and high reduction of a population's genetic pool due to environmental actions (such as flood) or human activities.

it's anything that aren't producers and consumers.

explanation:

you've got to be clear on what "this" is

i think that d. wind is the answer.   i missed the question when i answered a. currents.