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Across 5. body division that mirror each other 7. concentration of nerve cells at the anterior of the animlal 9. body cavity 11. animals that lacks a backbone 14. hollow ball of cells 15. middle germ layer 16. outer most germ layer

Down 1. body cavity with partially lined mesoderm 2. body parts that repeat around the center of the body 3. animals mouth formed from the blastopore 4. long supportive rod in a chordates body 6. animals with a dorsal hollow nerve chord 8. blastopore becomes the anus and mouth 10. animals with backbones 12. inner most germ layer 13. fertilized egg