Question

A period in which the densities of populations increase or decrease at the same time is called a _____.

Answer 1

Based on the options given, the most likely answer to this query is a boom bust cycle. Boom bust cycle is an economic variable where density of individuals increase or decrease at the same point in time. Thank you for your question. Please don't hesitate to ask in Brainly your queries. 

Answer 2

A boom bust cycle.

A period in which the densities of populations increase or decrease at the same time is called a boom bust cycle.

A boom bust cycle is a period of repetitive population change in which the size of a population repeatedly and regularly increases and decreases at the same time. In this cycle, ‘’boom” describes fast growth which is followed by “busts” during which the size of the population descends (shrinks) back to a minimal level.