As part of an experiment to measure decomposition rates of different materials, students put food scraps from the cafeteria in compost bin a and leaves and grass clippings in compost bin b for six weeks. students in first period measured the temperature in bin a, and students in sixth period measured the temperature in bin b. what is the greatest error in the students' experimental design?

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.