What characteristic is unique to echinoderms?
water vascular system
What type of symmetry do these organisms demonstrate?
secondary radial symmetry
What does the word "Echinodermata" mean?
What type of development do these animals have?
When did they appear in the evolutionary history?
Where are they found?
Type of circulatory system
type of respiratory system
type of nervous system
ring and radial nerves
type of body cavity