| B. The amniotic egg (8-20) |
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| • | 1. Structure |
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| • | a. Yolk sac |
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| • | b. Amnion |
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| • | c. Allantois |
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| • | d. Chorion |
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| • | 2. Aided evolutionary
adaptation to land |
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| • | 3. Made internal
fertilization mandatory |
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