Which combination of the below 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 rate

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

Explanation

Low mortality rate, high birth rate, high immigration rate and low emigration rate are causes for rapid over-crowding.