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
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
The combining forms for "vertebra" are ____________________ and vertebr/o
Fill in the blank(s) with correct word
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.