Hurry , what are sound waves in science ?

Sound is a vibration that propagates as an acoustic wave, through a transmission medium such as a gas, liquid or solid. In human physiology and psychology, sound is the reception of such waves and their perception by the brain

since there are no options posted i'll give you a few examples.

a dolphin's flipper, bird's wing, cat's leg.

protistas excret ethanol used in the manufacture of vinegar