The marine world is colorful and full of surprises that we don't know. Marine creatures are different from terrestrial creatures and have their uniqueness. Many times, we have less understanding of marine life. Today, let's take a look at jellyfish together!

In November 2007, a joint research team from the University of Utah, St. Paul, Smithson, and Kansas University published an article in the Public Science Library magazine. The author of the article found a trace of 500 million years ago on a rock in Utah, and a jellyfish left a layer of film in the sediment.

The fossil was found because the jellyfish died and sank into the fine sandy sediments, rather than the coarse ones. This allows them to be preserved well. Looking at the fossil, you can clearly see the shape of the jellyfish.

It is the oldest jellyfish ever found, pushing back the known birth point of jellyfish from 300 million years ago to 505 million years ago. It also confirms a popular suspicion among paleontologists that jellyfish are much older than humans thought from the fossil record at the time. 200 million years is a huge leap, equivalent to nearly doubling the history of jellyfish.

As we all know, jellyfish are so beautiful that they can be called the beautiful elves of the sea. The body of jellyfish is transparent and looks like an umbrella, and some of them have patterns on their bodies. When they swim, they look like beautiful umbrellas.

Jellyfish is an ancient aquatic creature that appeared 505 million years ago. The jellyfish's body structure is very simple. Compared with other animals, it is an animal without anything. Jellyfish have no brain, no central nervous system, and no respiratory system.

They are composed of water, and the water content of the jellyfish is more than 90 %. This means that once the jellyfish leaves the water, it will die soon. After hundreds of millions of years, the jellyfish family is also growing. At present, there are as many as more than 9,000 jellyfish varieties.

Jellyfish is a dangerous creatures that may carry toxic. Although the jellyfish looks very beautiful and looks docile, in fact, this creature is particularly fierce. Especially the jellyfish's tentacles have a lot of thorns cells. These cells can shoot certain venom. When they prey in the water, they will directly stab the prey, which will eventually cause the prey to be paralyzed and die.

So when many of us go swimming in the water these days, there's a good chance we'll get stung by a jellyfish. Once stung by a jellyfish, it is easy to have difficulty breathing. When people suffer such injuries, they should be given artificial respiration immediately. If the venom of a jellyfish is too powerful, it is likely to cause death.

Jellyfish don't have brains and can't think, but they're possessive. They are so ferocious that if they find any other species invading, the jellyfish will destroy them. For example, fishermen's nets are often damaged by jellyfish.

Therefore, when fishermen fish in the sea, they will avoid the gathering place of jellyfish as much as possible. Too many jellyfish will also affect the environment, for example, they will block the estuaries and hinder the normal circulation of the river.