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What are Jellyfish?
Jellyfish, jellies or sea jellies are the informal common names given to the medusa-phase of certain gelatinous members of the subphylum Medusozoa, a major part of the phylum Cnidaria.
A group of jellyfish is called a 'bloom', 'swarm' or 'smack'.
Can Jellyfish feel pain?
Jellyfish do have a neural network and are able to respond to touch. If something pokes them, they will recoil due to a simple stimulus-response event, but they will feel no pain as you experience pain.
Do Jellyfish sleep?
It may not seem surprising that jellyfish sleep - after all, mammals sleep, and other invertebrates such as worms and fruit flies sleep," said Ravi Nath, who co-led the research. "But jellyfish are the most evolutionarily ancient animals known to sleep.
What are they made of?
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.
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