15. Echinoderm identity card.
How are echinoderms
characterized according to
examples of representing
beings, basic morphology,
type of symmetry, germ layers
and coelom, digestive system,
respiratory system, circulatory
system, excretory system,
nervous system and types of
reproduction?

Gap-fill exercise

Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
Examples of representing : sea
cucumber, sea , starfishes. Basic
morphology: endoskeleton
with spines, system. Type of
: secondary radial. Germ
and coelom: triploblastics,
. Digestive system:
complete, . Respiratory
system: nonexistent.
system: nonexistent. Excretory :
nonexistent. Nervous system: ,
nerve network without or
cephalization. Types reproduction:
sexual, with stage.