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Chapter 22: Reproductive Systems and Life Stages

Difficulty Level: At Grade Created by: CK-12
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This picture shows the amazing moment when a human sperm and egg unite. The process is called fertilization. If it’s successful, it will lead to a brand new human being. Do you know how the sperm and egg are produced? Do you know how a fertilized egg develops into a complete and complex human being? You’ll find out when you read this chapter.

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Date Created:
Jan 22, 2015
Last Modified:
Dec 13, 2016
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