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What marks the end of the pre-embryonic period and the beginning of the embryonic period?

Chanta35

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What marks the end of the pre-embryonic period and the beginning of the embryonic period?

What marks the end of the pre-embryonic period and the beginning of the embryonic period?
A) implantation
B) the formation of the ectoderm and endoderm in the embryonic disk
C) the formation of the morula
D) the formation of the blastocyst
E) the formation of pharyngeal arches

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deb007

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Chanta35 Author

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Just got PERFECT on my quiz

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