When the jellyfish are born, they have no brain! Jellyfish is made out of water, muscles, and nerves, and that means they don't have heart, blood, and bones, too.
Mostly the jellyfishes weight about 20-400g (0.7-14oz).
Almost all jellyfish have cells that can sting, but 2003 the scientists discovered a kind of jellyfish called Big Red that had no tentacles, in California.
Mostly the jellyfishes weight about 20-400g (0.7-14oz).
Almost all jellyfish have cells that can sting, but 2003 the scientists discovered a kind of jellyfish called Big Red that had no tentacles, in California.