Which STD has the greatest number of cases in the U.S.?
a. HPV infections
b. AIDS
c. Syphilis
d. Chlamydia
e. Genital herpes
a
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Which of the following must occur in order to maintain a high pressure potential within guard cells?
A. Energy must be constantly expended. B. Stomata must take up more oxygen and less carbon dioxide. C. Water must exit guard cells by osmosis. D. Potassium ions must be actively transported out. E. The rate of transpiration must increase.
In angiosperms, the _______________ are the specialized reproductive organ(s) whose main function is to bring together the sperm and egg.
a. flowers b. seeds c. cones d. pollen grains e. leaves
Which of the following plants has a dominant sporophyte generation and a seed, but no fruit?
A) fern B) pine tree C) tulip D) moss
Platelets are formed when fragments from large cells called ________ break off
Fill in the blank(s) with correct word