Do jelly fish have a heart?
No. Jellyfish are pretty simple critters. They are composed of three layers: an outer layer, called the epidermis; a middle layer made of a thick, elastic, jelly-like substance called mesoglea; and an inner layer, called the gastrodermis. No brains either.
Join Alexa Answers
Help make Alexa smarter and share your knowledge with the worldLEARN MORE