The cells involved in blood clotting are
A. platelets.
B. hemoglobin.
C. white blood cells.
D. red blood cells.
Answer: A
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What is the discharge of a river that has an average width of 20 meters, an average depth of 5 meters, and an average velocity of 3 meters per second?
A. 150 cubic meters per second B. 100 meters squared C. 300 cubic meters per second D. 15 meters squared per second
What approach to control pollution is exemplified by the Clean Air Act?
taxation consumer choice subsidies command-and-control
A weather warning means that: a. hazardous weather conditions have terminated
b. hazardous weather conditions are either imminent or are already occurring. c. atmospheric conditions favor the formation of hazardous weather. d. None of these choices.
A molecule of hemoglobin is capable of binding how many molecules of CO2?
A) 1 B) 2 C) 3 D) 4