Campbell Biology (11th Edition)

Published by Pearson
ISBN 10: 0-13409-341-0
ISBN 13: 978-0-13409-341-3

Chapter 53 - 53.5 - Concept Check - Page 1205: 2


More than ten years.

Work Step by Step

You would need to observe more than one complete cycle, though this is the bare minimum to have any usable data. Observing multiple full cycles would be significantly more informative, but useful data could still be gathered from the minimum.
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