Across
- 1. hollow ball of cells
- 4. body cavity located entirely within the mesoderm
- 5. shows how animals are related through evolution
- 6. irregular in shape
- 7. body parts arranged around a central axis
- 9. lining of digestive tract
- 11. body cavity located between the mesoderm and endoderm
- 14. fluid filled space between the body wall and the digestive tract
Down
- 2. animals with no body cavity
- 3. body design with distinct left and right halves
- 8. anterior concentration of sensory structures and nerves
- 10. term used to describe an animal's shape, symmetry
- 12. outer layer of skin
- 13. most of the skeleton