Tropical forests receive ____
a. intense solar radiation and heavy rainfall
b. moderate solar radiation and heavy rainfall
c. intense solar radiation and virtually no rainfall
d. moderate solar radiation and moderate rainfall
e. low solar radiation and heavy rainfall
ANSWER: a
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The usual, naturally-occurring mechanism that prevents development of cancer is the action of ____
a. cytotoxic T cells b. oncogenes c. radiation d. chemotherapy e. carcinogens
A baby is born with spina bifida, which is a neural tube defect. This problem most likely initiated at which time in development?
A) late in the fetal period B) the pre-embryonic period C) the embryonic period D) early in the fetal period
Plant nutrients that stimulate specific bacterial species associated with a healthy colon are called
a. probiotics. b. prebiotics. c. antibiotics. d. nutritional supplements.
When the pH of the blood becomes more acidic, the respiratory center
A. decreases the rate and depth of breathing. B. increases the rate of breathing but decreases the depth. C. stops breathing altogether. D. increases the rate and depth of breathing. E. decreases the rate of breathing but increases the depth.