Paleontologists observed changes in the sizes of black bears as their environment changed. During warmer periods between ice ages, most black bears were small. During ice ages, most black bears were large. Which type of selection is this, and how would a graph of the distribution curve of black bear size change as Earth moved out of an ice age?(1 point)

Question

Responses

disruptive; the curve would break into two peaks with a dip in the middle
disruptive; the curve would break into two peaks with a dip in the middle

stabilizing; the curve would become taller in the middle and shorter on each side
stabilizing; the curve would become taller in the middle and shorter on each side

directional; the curve would shift to the right
directional; the curve would shift to the right

directional; the curve would shift to the left

Choose the best answer

Answer 1

The best answer is:

directional; the curve would shift to the right

This is because, as Earth moves out of an ice age and warmer conditions prevail, the size of black bears tends to increase, reflecting a directional selection towards larger sizes in that environment. The curve would shift to the right to represent this change in size distribution.