The gonads
A. are the male testes and female ovaries.
B. secrete sex hormones.
C. produce gametes.
D. are dormant until puberty.
E. All of the choices are correct.
E
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_______ is a fine, unpigmented, downy hair that first appears on the fetus in the last trimester of development
Fill in the blank with correct word.
A special type of mixing movement of chyme in the small intestine is called
A. peristalsis. B. mass movement. C. absorption. D. segmentation.
Compared to a solution with a pH of 7, a solution with a pH of 4 is
?A. more acidic and has a 1,000-fold increase in [H+].?B. more acidic and has a 300-fold increase in [H+].?C. more basic and has a 1,000-fold increase in [H+].?D. more basic and has a 300-fold increase in [H+].?E. more basic and has a 300-fold decrease in [H+].
The term "tonicity" refers to
A. the secretion of products outside of the cell through the plasma membrane. B. the effects of filtration on a cell. C. the effect of a solution on water movement into or out of cells. D. the separation of one cell into two daughter cells.