Which of the following is used to describe organisms leaving a population?

A.
immigration

B.
population clumping

C.
allopatric speciation

D.
emigration

D. emigration

The correct answer is D. emigration. Emigration refers to the process of individuals leaving a population and moving to another area.

The correct answer is D. emigration. Emigration is the term used to describe organisms leaving a population. To arrive at the answer, you need to understand the meaning of each option provided.

A. Immigration refers to organisms entering a population.

B. Population clumping refers to a pattern where individuals of a species are found in groups or clusters rather than being evenly distributed.

C. Allopatric speciation refers to the formation of new species due to geographic isolation.

D. Emigration is the movement of individuals out of a population.

By knowing the definitions of these terms, you can deduce that the action of organisms leaving a population is described as emigration.