Jellyfish is a coelenterate and an invertebrate, and their body structure is different from that of most animals. For example, they are heartless. In fact, the main component of jellyfish is water. Although the composition of human body is mainly water, the proportion of water in jellyfish can reach 95%, much more than that in human body. This makes the body of jellyfish mostly transparent or translucent, similar to jelly. 1. Does the jellyfish have a heart? Jellyfish is a coelenterate and invertebrate. There are many kinds of them, which are distributed all over the world. Their body structure is very different from that of humans and most animals, and some organs do not exist in the body structure of jellyfish. For example, jellyfish have no heart in their bodies, unlike most animals; In addition, their bodies have no brains, no lungs and so on.

In fact, the body structure of jellyfish is mainly water. Although human beings are mainly composed of water, the proportion of water in jellyfish is obviously higher than that in humans and other animals, because the water in their bodies accounts for 95%. Because their bodies are mainly water, jellyfish are generally transparent or translucent in appearance and look like transparent jelly or colloid. Moreover, it also makes their bodies very soft.

Second, do jellyfish have bones? As mentioned above, as a coelenterate jellyfish, its body structure is very special, and some important structures do not exist in its body, such as heart and brain. In addition, there is a structure that does not exist in their bodies, such as bones. Jellyfish have no bones, so they can keep their bodies in a very soft state. Generally speaking, their bodies are umbrella-shaped, but their seemingly very large bodies can pass through a very small hole precisely because they have no bones.