What are population dynamics?

Regular fluctuations in the population size of some animals.

Changes in populations through time.

Proportion of individuals at each possible age.

Number of individuals born each year in a population.

Changes in populations through time.

Explanation:

Population may be defined as the group of organisms that are belong to the same group of the same species. The particular population live in the particular geographical area.

The dynamics population means the change of population with respect to time. The population get change as the individual born and die every day. Some individuals move into the population shows immigrants and some individuals may leave the population and shows emmigrants.

Thus, the correct answer is option (A).