Nearly all forests in ________ have been cut at least once during the past 300 years, so very little original (virgin) forest remains
A) the United States, excluding Alaska,
B) the United States, excluding the western states,
C) Europe
D) Eurasia, excluding India and Pakistan,
E) North America, excluding Canada,
Answer: A
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A) Parasitism B) Commensalism C) Communalism D) Mutualism E) Competition
The energy source that powers most life on Earth is
A. solar. B. glucose. C. nuclear. D. none of the above
Which of the following is an inhibitory neurotransmitter?
A) aspartic acid B) cysteine C) taurine D) none of these
What role do fungi play in the formation of fertile soil?
A) They are a source of minerals. B) They carry out chemical reactions that convert carbon dioxide to nitrogen. C) They decompose organic material into compounds plants can use. D) They add air to soil.