Question

Which of the following systems found in echinoderms

• A. Nervous system
• B. Respiratory system
• C. Excretory system
• D. System of an internal skeleton

Answer 1

The correct option is D

System of an internal skeleton

Echinoderms are also united by a water vascular system that pushes water throughout their bodies, and by tube feet with tiny suckers on the ends. The Phylum Echinodermata doesn't always have spiny skin or a spiny surface, but these animals do all share a calcium carbonate internal skeleton or endoskeleton.