Biologists studying pigeons discovered that their experimental subjects were determining direction from the position of the sun by
A) injecting them with testosterone.
B) injecting them with estrogen.
C) disrupting their circadian clocks.
D) removing a portion of their brains involved with navigation.
E) carrying out selection experiments.

Question

Quizplus · Accepted Answer

Disrupting the pigeons' circadian clocks would interfere with their ability to use the sun's position for navigation, as their internal clocks help them determine the time of day and thus the sun's position relative to their location.

Biologists Studying Pigeons Discovered That Their Experimental Subjects Were Determining