. Recently, scientists have grown new cochlear hair cells in mice. What implications might this have for hearing loss if scientists can eventually grow new hair cells in humans? . Studies have shown that hearing loss increases with age, especially in people who are regularly exposed to loud noises. I (a) Give a reasonable explanation for why this happens. (b) What precautions should people take to avoid hearing loss as they get oldeI'? . Some animals, such as cats, can rotate their pinnae in different directions. Explain why this is an advantage for these animals over humans. . . Sometimes the eardrum can develop small perforations. In some cases, these perforations will heal naturally, just like the skin does when it receives a small cut. '5'\" ' (a) What effect will these perforations have on hearing? Explain your reasoning. (b) Research these perforations in eardrums. Explain how the perforations can affect the middle ear if they persist, and how the perforations are repaired