If sparrows are tested in constant light, their free-running periods are _____, whereas if they are tested in constant darkness, their free-running periods are _____.
A)more than 24 hours; less than 24 hours
B)less than 24 hours; more than 24 hours
C)absent; extended
D)extended; absent

Question

Quizplus · Accepted Answer

In constant light, sparrows typically have free-running periods of less than 24 hours, while in constant darkness, their free-running periods are more than 24 hours. This is due to the influence of light on their circadian rhythms.

If Sparrows Are Tested in Constant Light, Their Free-Running Periods