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5 / 16  During embryonic development, unique cell layers develop and distinguish during a stage called ________.
A  the blastula stage
B  the germ layer stage
C  the gastrula stage
D  the organogenesis stage

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Source:  OpenStax, Animals. OpenStax CNX. Mar 20, 2015 Download for free at https://legacy.cnx.org/content/col11771/1.1
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