Across
- 4. jawless fish
- 5. phyla do they have backbones or not
- 7. 4 pairs of legs
- 10. feathers covering their body
- 11. phyla
- 12. scaly skin
- 13. skeleton made of cartilage
- 15. they have spiny skin
Down
- 1. flattened body
- 2. mother produces milk
- 3. bony fish
- 6. segmentaed bodies
- 8. roundworms
- 9. vertebrates
- 11. lay their eggs in water
- 14. seccond largest phylum