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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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Source:  OpenStax, Biology. OpenStax CNX. Feb 29, 2016 Download for free at http://cnx.org/content/col11448/1.10
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