Biology, 10.06.2020 06:57 mrashrafkotkaat
Which of the following does NOT occur during the embryonic period? The primitive streak appears and begins to form the central nervous system. A blood vessel that will become the heart begins to pulsate. Facial features begin to form. Movements like stretching, yawning, and swallowing begin to occur.
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Which of the following does NOT occur during the embryonic period? The primitive streak appears and...
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