Across
- 4. - Animals that don’t have a backbone
- 6. - arthropods that have only two body regions
- 7. - invertebrates with long, flattened bodies and bilateral symmetry.
- 10. - a rigid body covering
- 11. - a group of animals that have radial symmetry
- 12. - soft bodied invertebrates that usually have a shell
Down
- 1. - primitive sedentary aquatic invertebrate with a soft porous body
- 2. - animals that have jointed appendages
- 3. - hollow bodied animals with two cell layers that are organized into tissues
- 5. - a group of parasites such as tapeworms.
- 8. - completely changing body form
- 9. - the arrangement of the individual parts of an object that can be divided into similar halves