Charlie w sponges and cnidarians

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Across
  1. 3. cant move
  2. 6. sperm and egg mixed together
  3. 7. blastula pushed in with slight indentation
  4. 12. complete body cavity
  5. 13. 32 or more cells with no cavity in the center
  6. 14. give sponges suport
  7. 15. can move
Down
  1. 1. divide into 2 4 8 16 cells
  2. 2. when cells are made different
  3. 4. inner lining of organs
  4. 5. only freshwater cnidarian
  5. 8. not symetrical
  6. 9. no body cavity
  7. 10. what is on the outside of sponges
  8. 11. cells make single layer around central cavity