Question

some populations experience periods in which the population increases and then periods in which the population decreases. the defining factor of this type of population growth is that they increase and decrease in size at fairly regular intervals. what type of population growth is this? irregular cyclical

Explanation:

The description mentions population increasing and decreasing at fairly regular intervals. Cyclical population growth is characterized by such regular - repeating patterns of increase and decrease, while irregular growth has no such regular intervals.

Answer:

Cyclical