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? stable irregular

Explanation:

The description mentions that the populations have large growth followed by death for no known reason and no observable pattern in growth/die - off. Stable population growth has a consistent and predictable pattern, while irregular population growth lacks a consistent pattern. So, this is irregular growth.

Answer:

Irregular