Base your answer on the information below and your knowledge of biology. an experiment was designed to investigate the effect of caffeine on the heartbeat of water fleas. two populations of water fleas were cultured. both populations were in water with the same mineral content, were supplied with identical amounts of bacteria as food, received the same amount of light, and had their temperature maintained at 20 degrees c. every two hours water fleas from both populations were selected and their heart beats were monitored. the fleas from population 1, however, had caffeine administered 5 minutes before the heartbeat was checked, while population 2 was given nothing.