The ____ is the protective sac around the embryo. 

A. yolk sac
B. amnion
C. umbilical cord
D. mesoderm
E. ectoderm

B. amnion
The amnion is a protective, fluid-filled sac that surrounds the embryo.

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The first-line drug used in the treatment of severe anaphylactic reaction is:

a. adenosine diphosphate b. epinephrine c. oxidized cellulose d. thrombin

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CSF is the abbreviation for __________________ fluid

Fill in the blank(s) with correct word

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