Sorry, I didn't quite catch that. The one sense all vertebrates use (0) ........... ..11> ........... a means of identifying potential danger is hearing, (9) ................................. there are examples of blind vertebrates, there seem to be no instances of naturally deaf ones, and animals can hear things around them no (10) ............... , ..... " ...... what they are doing, Hearing (11) ... into its own, however, with underwater creatures. Light only travels a short distance underwater before it disappears, (12) ............................. limits the value of sight for sea creatures. Conversely, sound travels faster and further than it does in the air, and any noises sea animals produce can be heard (13) ,. miles, Ironically, this causes problems as the underwater world is generally noisy and (14) ............................ can be confusing echoes; sea creatures have to sort through these to isolate a message meant (15) .......................... them. Marine animals use sound to navigate, communicate and locate food, so (16) .......................... this sense, they would be unable to function effectively. Giúp mình điền một từ thích hợp vào chỗ trống với . Hứa vote ạ