Circannual rhythms in birds are influenced by ________.
A) periods of food availability
B) periods of daylight and darkness
C) magnetic fields
D) lunar cycles

Name: Circannual rhythms in birds are influenced by ________. A) periods of food availability B) periods of daylight and darkness C) magnetic fields D) lunar cycles
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Question

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Circannual rhythms in birds are mainly influenced by the length of daylight and darkness, which changes seasonally. This is also known as photoperiodism.

Circannual Rhythms in Birds Are Influenced by ________