78. 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 many consumers need large amounts of nitrogen; for example, animal tissue
contains about 10 times as much nitrogen as plant tissue.
(B) Because most organisms are able to "fix" nitrogen more efficiently than plants.
(C) Because foods with lower nitrogen content are easier for consumers to digest, leading most
organisms to seek out low nitrogen foods.
(D) Because high nitrogen levels are a key part of plant chemical defenses, resulting in
organisms avoiding high nitrogen plants.