| A | B |
|---|
| Ectotherms | rely on behavior to help control body temperature |
| amniotic egg | a reptillian egg create a protected environment in which the embryo can develop without drying out. |
| carapace | dorsal part |
| plaston | ventral part |
| feathers | are made mostly of protein and develop from pis in teh birds skin. |
| endotherms | animals can generate their own body heat |
| crop | food is moistened and stored |
| gizzard | helps mechanical breakdown of food by grinding it. |
| air sacs | direct air through the lungs in an efficient, one-way flow |
