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:

Cyclical population growth is characterized by regular intervals of increase and decrease. The description in the question mentions population increasing and decreasing at fairly regular intervals, which aligns with the concept of cyclical growth. Irregular growth does not have such regular patterns.

Answer:

Cyclical