Jellyfish are simple marine animals that don’t have a brain or a heart. Instead of a brain, they have a nerve net that helps them sense their environment and control movements. Their bodies are mostly made of water, which makes them transparent and light.
Without a heart, jellyfish pump water through their bodies to move and get oxygen. They use their tentacles to catch prey and protect themselves from predators. Despite their simple anatomy, jellyfish have existed for millions of years and are very successful in the ocean.
Scientists study jellyfish to learn how basic life functions work and to understand ancient marine ecosystems. Their unique design shows how diverse life can be in adapting to different environments. Shutdown123