The nitrogen-limitation hypothesis states that organisms select food in terms of the nitrogen content of the tissue. Why might this be true?
A. Because most organisms are able to "fix" nitrogen more efficiently than plants.
B. Because foods with lower nitrogen content are easier for consumers to digest, leading most organisms to seek out low nitrogen foods.
C. Because plant tissues contain, on average, 10 times the level of nitrogen needed by most consumers.
D. Because many consumers need large amounts of nitrogen; for example, animal tissue contains about 10 times as much nitrogen as plant tissue.
E. Because high nitrogen levels are a key part of plant chemical defenses, resulting in organisms avoiding high nitrogen plants.
Answer: D
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