When was the jellyfish weather forecast invented? What difficulties have you encountered? quick

Before the storm warning, jellyfish had received the warning of secondary waves from the water. The secondary wave is an 8 ~ 13 Hz sound wave generated by the intense friction between air and ocean. Its propagation speed in water is1450m per second, which is much faster than storms and oceans. We can't hear this kind of secondary wave, because the range of sound waves that the human ear can hear is between 20 and 20000 Hz.

Why can jellyfish hear secondary waves? To answer this question, we must study the structure of jellyfish: jellyfish is an umbrella-shaped floating body with tentacles at the edge of the umbrella and eight notches, each of which has a receptor, also known as tentacle sac. Among the tentacles of jellyfish, there is also a slender handle with a small ball on it, which is the ear of jellyfish that can hear secondary waves. In the inner ear of jellyfish, there is a small stone called Shi Ting, which vibrates. Shi Ting then transmits the vibration to the nerve receptors in the ear wall of the jellyfish, and the jellyfish hears the storm warning issued by infrasound waves, so the jellyfish rushes to the sea to find a safe place.