Long ago, it was believed that maggots came from meat. In the late 1600s, Francesco Redi hypothesized that maggots came from flies rather than from meat. Which of these experimental designs could be used to test Redi's hypothesis?
an experiment using covered, unrefrigerated meat
an experiment using uncovered, unrefrigerated meat
an experiment using flies under a bell jar
both A and B

Question

Long ago, it was believed that maggots came from meat. In the late 1600s, Francesco Redi hypothesized that maggots came from flies rather than from meat. Which of these experimental designs could be used to test Redi's hypothesis?
an experiment using covered, unrefrigerated meat
an experiment using uncovered, unrefrigerated meat
an experiment using flies under a bell jar
both A and B