A microbe from a high-temperature hot spring is isolated. What is the best way to tell if this microbe is an archaean? Choose one: A. Assay its cell wall material for peptidoglycan, an indicator of an archaean. B. Look at it with an electron microscope to determine if it lacks a nucleus, indicative of a prokaryotic archaean. C. Sequence some of its genome to determine what other organisms it is phylogenetically related to. D. Nothing needs to be done. The fact that it was isolated from a high-temperature environment indicates that it is an archaean.

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.