Here's why:
* Complex Structure: Jellyfish have distinct tissues and organs, unlike single-celled organisms. They possess a nervous system, digestive system, and even a rudimentary muscle system.
* Individual Cells: While they are made up of many cells, these cells are not independent but work together in a coordinated way to form a complex organism.
* Specialized Functions: Different cells in a jellyfish have specialized functions, like stinging cells (nematocysts) for defense and capturing prey.
Colonial organisms, like corals, are different. They are made up of individual, often genetically identical organisms (polyps) that live together and cooperate, but each polyp can survive on its own.
Jellyfish, on the other hand, are single organisms that have evolved to be multicellular with a complex internal structure.
