1. insect flight is being studied by a team of biologists at the university of california, berkeley. insect flight is studied by a team of biologists at the university of california, berkeley. a team of scientists at the university of california, berkeley, is studying insect flight. no change. 2. some intriguing facts about insect flight have been discovered by scientists. some intriguing facts about insect flight are being discovered by scientists. scientists have discovered some intriguing facts about insect flight. no change. 3. the flight muscles of insects demonstrate the highest-known metabolic rate of any animal structure. the highest-known metabolic rate of any animal structure is being exhibited by insects' flight muscles. the highest-known metabolic rate of any animal structure is being exhibited by insects' flight muscles. no change. 4. the most diverse wing structures of any flying animals are had by insects. insects have the most diverse wing structure of any flying animals. the most diverse wing structures of any flying animals are being had by insects. no change.