A Human Embryologist Examines a 3-Week-Old Embryo and Notices That

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Q114: If the formation of the endoderm does

Q115: Cells differentiate during development because<br>A) in each

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Q117: In humans, implantation occurs<br>A) immediately after fertilization.<br>B)

Q118: The muscle and bone tissues of adults

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Q122: Cellular differentiation depends on which genes are