What are jellyfish made up of?

1. Water: The majority of a jellyfish's body (up to 95%) is water. This gives them their characteristic gelatinous, wobbly texture.

2. Mesoglea: This is a jelly-like substance that fills the space between the jellyfish's outer layer (epidermis) and inner layer (gastrodermis). It's mainly composed of water, but also contains some collagen and other proteins.

3. Epidermis: This is the outer layer of the jellyfish's body. It contains nerve cells, sensory cells, and stinging cells called nematocysts.

4. Gastrodermis: This is the inner layer of the jellyfish's body. It lines the digestive cavity and is responsible for digesting food.

5. Tentacles: These are long, trailing appendages that are used to capture prey. Tentacles are covered in stinging cells that paralyze their victims.

6. Mouth: The mouth is located in the center of the bell-shaped body and serves as both the entrance for food and the exit for waste.

7. Gonads: Jellyfish reproduce sexually, and they have gonads (reproductive organs) that produce either sperm or eggs.

8. Manubrium: This is a stalk-like structure that hangs from the jellyfish's bell and connects the mouth to the stomach.

While jellyfish may seem simple, they are complex organisms with a unique structure that allows them to thrive in the ocean.