Q: Q: Echinoderms have a unique system for gas exchange, nutrient circulation, and locomotion called the water vascular system. the system consists of a central ring canal and radial canals extending along each arm. water circulates through these structures allowing for gas, nutrient, and this? A:

Choose from:
A). water evaporation
B). nerve exchange
C). cell exchange
D). waste exchange
The answer is:
D).