Which of the following statements about the phosphorus cycle is true? a. in living organisms, phosphorus can be found in nucleic acids. b. phosphorus in aquatic ecosystems is only found in sediment. c. elevated levels of phosphorus in aquatic ecosystems is always beneficial. d. the soil plays no part in the phosphorus cycle.

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.