When a plant dies, most of the nitrogen in the plant’s tissues is: A. consumed by animals in the soil. B. unable to go on as part of the nitrogen cycle. C. released into the soil by bacteria. D. able to go directly back into the atmosphere.

Based on the observation that only male crickets produce a song, you hypothesize that a male's song is a form of communication to potential mates. you set up a simple experiment to test this hypothesis. in the laboratory, you place a male snowy tree cricket in enclosure a, which is adjacent to enclosureb. in enclosure b, you place other insects, one at a time, and observe their responses to the male's song. the enclosures are designed so that the two insects being tested cannot see or smell each other, but sound is transmitted from enclosure a to enclosureb.