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8.2 The evolutionary history of the animal kingdom  (Page 4/15)

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4 / 15  Which of the following periods is the earliest during which animals may have appeared?
A  Ordovician period
B  Cambrian period
C  Ediacaran period
D  Cryogenian period
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Practice MCQ 6 FlashCards 2 Key Terms 4

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Source:  OpenStax, 101-nya-05 - general biology i. OpenStax CNX. Jul 22, 2015 Download for free at http://legacy.cnx.org/content/col11849/1.2
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