Which combination of the above can cause rapid over-crowding in climax biotic communities and human settlements?

I. High birth rate and high immigration rate

II. Low birth rate and high immigration rate

III. Low mortality rate and low emigration

IV. High mortality rate and high emigration rate.

A. II and III
B. I and III
C. I and IV
D. I and II

Correct Answer:

Option B – I and III