Question

some populations experience large growth and then they die for no known reason. these populations seem to have no observable pattern in their growth/die - off. what type of population growth is this? irregular stable

Explanation:

The problem is about population growth patterns. An irregular population growth pattern is characterized by no observable, consistent pattern in growth or die - off, which matches the description in the question. A stable growth pattern would have a more consistent and predictable pattern, so it does not fit.

Answer:

Irregular