The human embryo's first blood cells arise in the ______.
A) developing liver
B) amnion
C) yolk sac
D) allantois
Correct Answer:
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Q1: Hermaphrodites _.
A)possess both male and female reproductive
Q17: Reproductive systems with external fertilization are most
Q19: Why are human testes located in an
Q21: The animal in the accompanying figure illustrates
Q22: The liver,pancreas,and lining of the digestive tract
Q23: Which one of the following is a
Q28: What is gestation?
A)conception
B)fertilization
C)development
D)pregnancy
Q28: The "grandmother hypothesis" suggests that a woman
Q38: The lifeline between the embryo and the
Q40: Which of the following processes dominates the
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