Two students described a part of earth's middle layer. bob: the deepest part joe: the semi-fluid part which part of the middle layer did bob and joe describe? a. they both described the mesosphere. b. they both described the asthenosphere. c. bob described the mesosphere and joe described the asthenosphere. d. bob described the asthenosphere and joe described the mesosphere.

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.