Which extraembryonic membrane encloses a fluid-filled sac?

a. yolk sac
b. amnion
c. chorion
d. allantois
e. umbilical cord


ANSWER: b

Biology & Microbiology

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When cancer cells have the ability to migrate to other parts of the body, they are said to be

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What was the first antibiotic, discovered as a result of a laboratory accident?

What will be an ideal response?

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The sequence of nitrogen-containing bases on one strand of DNA could determine all of the following EXCEPT the sequence of

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