Jellyfish do not have blood. According to available information, jellyfish are composed of about 95% water and lack vital components like a brain, heart, and blood.
Here's a breakdown:
- No Blood: Jellyfish lack a circulatory system, meaning they have no blood to transport oxygen or nutrients.
- Water Composition: Their bodies consist mainly of water, facilitating the diffusion of necessary substances.
- Simple Structure: Jellyfish have simple structures, which do not require complex systems like a circulatory system.
For example, Moon jellies use mucus on their bells to catch plankton, and tentacles transfer the microscopic meals to their mouth parts, showing their simple feeding and bodily functions.
