H Jelly Fish

Jellyfish are fascinating creatures! Here are some key points about them:

1. **Ancient Creatures**: Jellyfish have been around for millions of years, even before dinosaurs.
2. **Gelatinous Bodies**: Their bodies are made of a gelatinous substance, which gives them their unique texture.
3. **No Brain, No Heart**: They don't have brains, hearts, or even bones.
4. **Venomous Tentacles**: Many species have venomous tentacles used for hunting prey.
5. **Stinging Cells**: Their tentacles contain specialized cells called nematocysts, which release venom into their prey.
6. **Ocean Drifters**: Jellyfish drift with ocean currents, but some can swim using a pulsating motion.
7. **Varied Sizes**: They range in size from tiny, nearly invisible ones to giants with tentacles spanning many meters.
8. **Environmental Indicators**: Their population fluctuations can indicate changes in ocean health and ecosystems.