Life: The Science of Biology 11th Edition

Published by W. H. Freeman
ISBN 10: 1-31901-016-4
ISBN 13: 978-1-31901-016-4

Chapter 52 - Animal Behavior - 52.5 - Behavior Can Be Studied Mechanistically - 52.5 Recap - Learning Outcomes - Page 1134: 1


Animals abide by their circadian rhythms that represent a cycle operating as part of the organism's internal clock. Since these rhythms are not precisely 24 hours long, they are entrained to fit the day and night cycles of the natural environment. If an animal is kept in a constant environment, its circadian rhythm won't entrain and would instead maintain a free-running cycle.

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