Question

Robins migrate south during the winter months to avoid harsh conditions and then return north during the summer. What environmental condition are the robins most likely responding to in order to determine when the seasons are changing?
A.)The tilt of Earth on its axis.
B.)Fluctuations in predator populations.
C.)Changing length of daylight hours.
D.)Increasing availability of water.

Answer 1

The answer is A or C because they wouldn’t just fly north because of predators and water availability so the Robins can either sense the tilt or can tell by the day hours.