a. 4 c. 14 b. 7 d. 21
a. 12 c. 24 b. 18 d. 36
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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
Women are 50% to 75% more likely than men to experience an adverse drug reaction.
Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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