Which of the following is NOT a reason the atmosphere is important to life on Earth? A. It contains oxygen and other gases needed by living organisms.
B. It keeps the cold temperatures close to the ground.
C. It protects us from the sun’s radiation and objects from outer space.
D. It maintains moderate temperatures so that we have water in liquid form.

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.