Is a jellyfish hollow body animal?

That's a great question! While jellyfish are often described as "hollow," it's a bit of an oversimplification.

Here's the truth:

* Jellyfish do have a central cavity, but it's not completely empty. This cavity is called the gastrovascular cavity, and it functions as both a stomach and a circulatory system.

* The gastrovascular cavity contains water and is lined with tissues. These tissues are responsible for digesting food and transporting nutrients throughout the animal's body.

* Jellyfish have other tissues and organs as well. These include their nervous system, muscles, and reproductive organs.

So, while jellyfish don't have a solid internal structure like many animals, they are not completely hollow. They have a complex internal structure that allows them to survive and thrive in the ocean.