Life: The Science of Biology
11th Edition
ISBN: 9781319010164
Author: David E. Sadava, David M. Hillis, H. Craig Heller, Sally D. Hacker
Publisher: W. H. Freeman
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Chapter 52.5, Problem 1R
Summary Introduction
To review:
The free-running circadian rhythm, which is entrained to 24-hour day by light.
Introduction:
Circadian rhythm is a biological clock specific to each animal, which determines sleep-wake cycle, eating, and other normal activities. It is not a 24-hour clock based on the Earth rotation on its axis, which changes day-light cycles when the Earth revolves around the Sun.
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