I don't know if this was the intent but the question seems to be in pursuit of a 'design' type of answer and that simply isn't the way things work. Jellyfish, and every other organism, arose from a process of selection rather than design. If an or... read more
Jellyfish exist because they are suited to their environment. Their “purpose” is to reproduce and continue their line; in the final analysis, every other function (eating, defense, movement, etc.) is in service of reproduction. read more
If a jellyfish washes up on the beach, it will mostly disappear as the water evaporates. Most are transparent and bell-shaped. Their bodies have radial symmetry, which means that the body parts extend from a central point like the spokes on a wheel. read more