You are dispatched to a residence for a 67-year-old female who was awakened by shortness of breath and sharp chest pain. her husband tells you that she was recently discharged from the hospital after having hip surgery. your assessment reveals dried blood around her mouth, facial cyanosis, and an oxygen saturation of 88%. you should suspect:

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.