Question

the graph below shows changes in the size of a mammal population in the early 1900s. which of the following explanations is the most likely reason for the dramatic population change between 1915 and 1925? a) a decrease in the birth rate of the mammal population b) an increase in the death rate of the mammal population c) a large decrease in the number of the mammals predators d) a large increase in snowfall for several months in the mammals habitat

Explanation:

A decrease in the birth - rate of the mammal population would directly lead to fewer new individuals being added to the population, causing a rapid decline in population size over a short period. A decrease in predators would likely increase the mammal population, an increase in the death - rate is a more general factor compared to the direct effect of birth - rate change, and an increase in snowfall for several months is an environmental factor with a less immediate and direct impact on population size compared to birth - rate change.

Answer:

a. a decrease in the birth rate of the mammal population