Ecology help!?

Question

1, Unlimited population growth is often prevented when death rates increase as population density increases.

a) K-selection

b) r-selection

c) positive feedback

d) negative feedback

e) the Allee effect

I do not understand biology, well population ecology. and i cant find the answer to this. Could a relevant person help?

Answer 1

d) negative feedback

The response is the opposite which lets you know it is negative.  If the response was in the same direction it would be positive.  K and r- selection has to do with the reproduction rates of a species.  The allee effect should be the allele effect which has to do with evolution.