0. List ten features of arthropods.

1. a) State the functions of the water vascular system of asteroid echirnoderms.

b) Name five canals that make up the water vascular system of asteroid echirnoderms.

2. Illustrate a typical biramous appendage using a fully labelled diagram and name two functional modifications of this appendage in the abdominal region of the freshwater crayfish.

3. Give the functionalroles of each of the following annelidan features:

a) Parapodium
b) Coelomic fluid

4. With the aid of a labelled diagram, illustrae the structure of the arthropod
exoskeleton.

5. List the characteristic features of the phylum annelida.

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