Across
- 5. reptiles circulatory system
- 9. made mostly of protein
- 11. breaks down food by grinding it
- 12. vertebrate that had dry, scaly skin, lungs, and terrestrial eggs with several membranes.
- 13. sacs where air first enters in the body cavity and bones
- 14. animals can generate their own body heat
- 17. this is made up of two parts, carapace and plastron
Down
- 1. embryo can develop without drying out
- 2. retiles have what for eating
- 3. birds have ____ hearts
- 4. is a fossils show mixture of characteristics of birds and dinosaurs
- 6. pollinate flowers
- 7. food is stored and moistened before it moves further in the digestive tract
- 8. rely on behavior to help control body temperature
- 10. Period 245 million years ago
- 15. the food birds eat are based on the shape of the what
- 16. some birds can’t what