What animals have no bones?

Answer

Animals without bones are called cartilaginous animals. All sharks are cartilaginous as are certain fish. Cartilaginous means they have skeletons that are made up of cartilage instead of bones. Starfish are also animals without bones. Other animals without bones include jellyfish, leeches and butterflies. All species of worms are also animals without bones, such as the earthworm, flatworm, and roundworms. Another animal without bones are protozoa. This is because they are the smallest animal in the world. Protozoa animals include flagellates and amoebas.
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