A population of alligators lives in a wetland habitat. Which of these describes a density-dependent factor that could affect this population? A. humans intkrduce pollution into the water of the ecosystem
B. a hurricane passes through the area
C. there is a decrease in prey animals on the ecosystem
D. a drought that lasts for several mounths occurs

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.