Question

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)

Responses

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

directional; the curve would shift to the left
directional; the curve would shift to the left

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

Answer 1

[AI-generated answer — Bot GPT 3.5]

directional; the curve would shift to the right

This is directional selection because the size of black bears is shifting towards larger sizes during ice ages. As Earth moved out of an ice age, the distribution curve of black bear size would shift to the right, indicating an increase in the size of black bears.