Consumers that eat primary producers are called ____
A) primary consumers
B) top consumers
C) autotrophs
D) trophic consumers
A
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At the beginning of the Proterozoic, Earth’s atmosphere was mostly ____
a. oxygen b. nitrogen c. carbon dioxide d. water vapor e. argon
Proxy data used to estimate global temperatures of the past suggest that:
A) the earth is warming at an unusual rate. B) the earth is warming at a rate consistent with natural causes. C) the earth is cooling at an unusual rate. D) the earth is cooling at a rate consistent with natural causes.
Which of the following best describes renewable energy resources?
A) They currently supply 20% of the Earth's electricity. B) They contribute only 70% as much greenhouse gases as fossil fuels do. C) They have been largely ignored by the Obama administration. D) They are unsuitable for the economies of developing nations.
The highest frequency of thunderstorms in the United States occurs in?
a. ?California. b. ?Kansas. c. ?Colorado. d. ?Maine. e. ?Florida.