The sentence describing jellyfish is under the cross.

Jia Baoyu said, "Daughter is made of water". Because the daughter's jellyfish contains more than 98% water, it is a standard "water bag". The "water bag" structure is simple and exquisite, and it consists of only two layers of germ layers: the inner layer and the outer layer, with the mesoderm in the middle. But its movement mode is very advanced, and its principle is like a rocket jet engine. When you want to act, the endoderm contracts rapidly, and the water in your body can be sprayed backwards. What's even more rare is that jellyfish can rise and fall like a submarine, and it has its own "carbon monoxide generator"-a special gland. When the sea is calm, the carbon monoxide produced by glands quickly fills the body, and jellyfish slowly floats; When you meet the enemy, you will quickly deflate, dive at high speed, and be flexible. There is also a kind of "listening stone" on the tentacles of jellyfish, which is a highly sensitive "infrasound sensor" When a big storm is coming, "Tingshi" will perceive infrasound waves generated by waves and air vibration more than ten hours in advance, and jellyfish will soon disappear from the sea and hide in deep water.