In a certain population of snakes, there is variation in the body length trait. Some snakes have longer bodies, and other snakes have shorter bodies.

Question

The following graph shows how an environmental change shifted the population’s body length trait distribution.
A line graph shows Number of snakes on the y-axis and Body length from shorter to longer along the x-axis. A solid line represents before environmental change and a dashed line represents after environmental change. The solid line begins at the bottom left corner of the graph and gradually curves up, peaks about two thirds of the way along, and steeply curves down. The dashed line begins at the bottom left corner of the graph and steeply curves up, peaks about one third of the way along, and gradually curves down.
A line graph shows Number of snakes on the y-axis and Body length from shorter to longer along the x-axis. A solid line represents before environmental change and a dashed line represents after environmental change. The solid line begins at the bottom left corner of the graph and gradually curves up, peaks about two thirds of the way along, and steeply curves down. The dashed line begins at the bottom left corner of the graph and steeply curves up, peaks about one third of the way along, and gradually curves down.
According to the graph, how did the environmental change affect the body length trait in the snake population?
Choose 1 answer:
Choose 1 answer:
(Choice A) Snakes with longer bodies became more common.
A
Snakes with longer bodies became more common.
(Choice B) Snakes with shorter bodies became more common.
B
Snakes with shorter bodies became more common.

Answer 1

(Choice B) Snakes with shorter bodies became more common.