The HIV virus can be transmitted
A. only from males to other males.
B. during unprotected sexual intercourse.
C. by coughing or sneezing.
D. by contact with people at work.
E. by hugging an infected child.
B
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Why is vision sharpest in the fovea?
A) It has more rods. B) It has more cones. C) There is less interference with overlying cells. D) It contains the focal point.
Separation of the inner cell mass from the trophoblast forms the
A) blastocoele. B) lacunae. C) amniotic cavity. D) chorion. E) allantois.
Approximately what percentage of body weight does muscle comprise?
a. 20% b. 35% c. 50% d. 70% e. 85%
____________________ contractions are responsible for mixing the colonic contents, whereas ____________________ periodically propel the contents long distances
Fill in the blank(s) with correct word