I would say cartilage because that is the unusual material they are made of
Hope this helps :)
Answer:
B
Explanation:
The answer you are looking for is B.
Answer:
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.
