The Planet

The Mysterious World of Jellyfish: Nature’s Floating Enigmas Jellyfish have been drifting through Earth’s oceans for over 500 million years, making them some of the oldest living creatures on the planet. Despite their simple, translucent bodies, these fascinating animals play a crucial role in marine ecosystems and continue to captivate scientists and ocean lovers alike. ● What Are Jellyfish? Jellyfish belong to the phylum Cnidaria and the class Scyphozoa, though other types exist, including box jellyfish (Cubozoa) and hydrozoans (Hydrozoa). They are invertebrates, meaning they lack bones, and are composed mostly of water—about 95–98% of their bodies. Instead of a brain or heart, jellyfish rely on a nerve net to sense their surroundings. Their pulsating, umbrella-like bell propels them forward, while their tentacles contain specialized cells called nematocysts, which deliver venomous stings to prey or potential threats. ● Survival Without a Brain One of the most fascinating...