the fossil record shows that the average size of black bears was large during cold glacial periods and got…

the fossil record shows that the average size of black bears was large during cold glacial periods and got smaller during warmer time periods. what is this an example of?\n directional selection\n disruptive selection\n ecosystem selection\n stabilizing selection

the fossil record shows that the average size of black bears was large during cold glacial periods and got smaller during warmer time periods. what is this an example of?\n directional selection\n disruptive selection\n ecosystem selection\n stabilizing selection

Answer

Answer:

A. directional selection

Brief Explanations:

Directional selection favors one extreme phenotype. Here, bear size changes in one - direction (larger in cold, smaller in warm) in response to environmental change.