Across
- 3. Large opening in a sponge
- 6. Hollow ball of small cells, center appears lighter in color than outside ring
- 9. Term for when each cell becomes specialized
- 10. When an egg and sperm combine
- 12. Cell layer that forms the digestive and respiratory system after differentiation
- 13. Small opening in a sponge
- 14. The creation of egg and sperm
- 15. When there are 2 layers of cells, what is the outside layer called?
Down
- 1. Solid ball of small cells
- 2. When the ball of cells begins to lengthen and indent at a point
- 4. Line interior of sponge, use flagella to bring in water
- 5. The only fresh water cnidarian
- 7. Gives support and structure to the sponge
- 8. Type of symmetry in which the animal is very motile
- 11. When an animal or organism doesn't move (stationary)