Which of the following occurs during the embryonic stage of development?

A. Heartbeat can be heard.
B. Testes descend into the scrotum.
C. Chorion appears.
D. Nose, eyes, and ears become noticeable.
E. Fingernails appear.


Answer: D

Biology & Microbiology

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A woman heterozygous for color blindness (an Xlinked

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How were insertion sequences (IS elements) first discovered?

What will be an ideal response?

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