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?
spiny skin
What type of development do these animals have?
deuterostome
When did they appear in the evolutionary history?
precambium
Where are they found?
ocean
Type of circulatory system
reduced
type of respiratory system
dermal branchiae
type of nervous system
ring and radial nerves
type of body cavity
eucoelomates