During which of the following times in development are teratogens most effective?
A. Blastocyst Stage
B. Embryonic Period
C. Fetal Period
D. Gastrulation
E. Two-Cell Stage
Answer: B. Embryonic Period
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Which of the following would be least likely to cause DNA damage to an individual suffering from xeroderma pigmentosum?
A) direct sunlight B) tanning beds C) incandescent light bulbs D) reflected sunlight
The greatest drop in blood pressure occurs in the
a. arteries. b. arterioles. c. capillaries. d. venules. e. veins.
Since 1750, the main cause of increased carbon dioxide being released into the atmosphere is:
a. the burning of fossil fuels such as coal and gasoline. b. the burning of wood. c. cattle production. d. erosion. e. decompostion
The vessels in our circulatory system that allow molecules to diffuse across their walls to tissues are
A. arteries. B. lymph vessels. C. veins. D. capillaries. E. venules.