Which element has the atomic number 12?
A. C
B. Na
C. Be
D. Mg
E. B
Answer: D
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Which of the following thermometers has a small dumbbell-shaped glass index marker in the tube?
A. electrical thermometer B. bimetallic thermometer C. maximum thermometer D. minimum thermometer
Barry Commoner coined the First Law of Ecology: "Everything is connected to everything else" in 1971. Which example best illustrates this law?
A. biogeochemical cycles B. gross primary productivity C. net primary productivity D. tropical rainforest E. natural capital
Which of the following is true of adaptive immunity when an invader is encountered for the second time?
A) The first and second responses are both slow. B) The first response is faster than the second. C) The second response is faster than the first. D) There is no need for a second response.
The modified Köppen climate classification as used in the textbook includes ________ major climatic groups
A) 3 B) 5 C) 8 D) 10 E) 15