What is a skeleton for jellyfish made of?

Jellyfish don't have bones or a traditional skeleton like vertebrates do. Instead, they have a hydrostatic skeleton.

Here's how it works:

* Water: The majority of a jellyfish's body is made up of water, held within a layer of cells called the mesoglea. This layer is gelatinous and flexible.

* Muscle Contractions: Jellyfish have muscles that can contract and relax. These contractions change the shape of the mesoglea, allowing the jellyfish to move, pulse, and even capture prey.

* Hydrostatic Pressure: The water inside the mesoglea acts like a fluid skeleton. When the muscles contract, they squeeze the water, creating pressure. This pressure helps maintain the jellyfish's shape and allows it to move.

So, while they might look fragile, jellyfish have a surprisingly effective and flexible skeletal system!