Question

In the park, scientists use a biological method of controlling dinosaur populations. Which of the following biological processes is used to regulate population sizes in real ecosystems?
Responses

Mutation
Mutation

Immigration and emigration
Immigration and emigration

Natural selection and competition
Natural selection and competition

Cloning

Answer 1

In real ecosystems, the biological processes that are primarily used to regulate population sizes include **natural selection and competition**. These processes influence which individuals survive and reproduce based on their adaptations to the environment and the competition for resources.

While immigration and emigration do affect population dynamics by altering the number of individuals in a population, they are not inherently biological processes like natural selection. Mutation and cloning do not directly control population sizes in an ecological context as they refer to genetic changes or reproduction methods, respectively.

So, the correct response is:

**Natural selection and competition**.