Question

what explanation fits the growth model portrayed in the graph?
a limits to resources exist for a population.
b there were no limits to resources in the given population.
c food was in surplus for the population since it increased at a constant rate.
d gestation periods lengthened as time went on, decreasing the growth rate of the population.

Explanation:

The graph shows a logistic growth model. In logistic growth, as the population increases, it approaches the carrying capacity. This indicates that there are limits to resources (such as food, space etc.) for the population. If there were no limits (exponential growth), the curve would keep rising steeply without leveling off. Option C is incorrect as the growth is not at a constant rate (it slows as it approaches carrying capacity). There is no indication in the graph about gestation periods (eliminates D).

Answer:

A. Limits to resources exist for a population.