"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"
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