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 thymus gland is actually composed of lymphoid tissue and is located in the mediastinal cavity, in front of and above the ________.

A. lungs B. pancreas C. heart D. small intestines

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What is diversity?

A) Differences, dissimilarities, variations B) Racial or ethnic groups C) Personality types D) Similarities, common ground E) All of the above F) None of the above

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The combining forms for "vertebra" are ____________________ and vertebr/o

Fill in the blank(s) with correct word

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The sensor receptive cells in the retina that function BEST in dim light and enable night vision are the:

A) iris. B) cones. C) pupil. D) rods.

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