Multiple Choice
The first of the extraembryonic membranes to appear, which ultimately becomes involved in blood cell formation, is the ________.
A) amnion
B) allantois
C) chorion
D) yolk sac
E) None of the answers are correct.
Correct Answer:

Verified
Correct Answer:
Verified
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Q55: Figure 28.5<br> <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB4856/.jpg" alt="Figure 28.5
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