Question

What is echinoderms?explain it

Answer 1

Echinoderms (scientific name Echinodermata) are a major group of only marine animals. The name comes from the Greek word for "spiny skin". There are about 7,000 species found usually on the sea floor in every marine habitat from the intertidal zone to the ocean depths. They have a wide variety of colours. There are at least 800 species of echinoderm on the Great Barrier Reef.

Echinoderms have radial symmetry, many having five or multiples of five arms. They have a shell, made mainly of calcium carbonate, which is covered by skin.

Answer 2

Echinodermata is a phylum of kingdom animalia. The word echino means hedgehog or spiny and the word derma means skin. S these are the animal with spiny skins. They are triploblastic i.e, their skin or outer covering is made up of three layers. They use water driver tube system for locomotion. They have a skeleton structure made of calcium carbonate.
Examples: starfish, sea urchin, antedon, etc.