Which is the change in size of a group of organism of the same species over time?

Population Growth

Explanation:

A group of individuals of same species that are present in the same habitat is called population. The size of population changes over time depending on the availability of resources and biological interactions (competition, predation, etc.).

All these factors increase or decrease the size of the population over time. This change in the size of the population in a given time period is called as population growth .

Change in size of a group of organisms of the same species over time is called: A. population growth

the answer is c because it is most logical.