Across
- 3. have an exoskeleton
- 4. largest group of arthopods
- 7. hair or fur,lungs, make milk for young
- 9. have lungs, wings, and feathers
- 10. made of pores filter food from water
- 11. have gills the develop lungs
- 12. have tentacles
Down
- 1. animals with backbone
- 2. no skeleton
- 4. animals without backbone
- 5. move by a muscle called a foot
- 6. have gills, scales, spend whole life in water
- 8. scaly skin, lungs, and lay eggs
- 10. stars eat with tube foot