Do Echinoderms live on the ocean bottom?

Explanation:

Echinoderms are marine organisms which means they live in the ocean. They are found in all marine waters on Earth although there are few species living in the Arctic. Many echinoderms are visible on the seashore such as sand dollars, globular spiny sea urchins and asteroids.

Most adult echinoderms live on the bottom of the ocean floor.

the backbone of the dna and rna compound is sugar phosphate.

b.have there own function.