Echinoderms have radial
symmetry, many having five or multiples of five arms. They have a
shell, made mainly of calcium carbonate, which is covered by skin
Echinoderms have a a poorly developed respiratory system. They use simple gills and their tube feet to take in oxygen and pass out carbon dioxide.
Tube Feet
Echinoderms have a a poorly developed respiratory system. They use simple gills and their tube feet to take in oxygen and pass out carbon dioxide.
Tube Feet