| A | B |
|---|
| pulmonary circuit | collection of blood vessels that carries blood between the lungs and heart |
| systemic circuit | collection of blood vessels that carries blood between the heart and the rest of the body, except for the lungs |
| ectotherm | organism that regulates its body temperature by exchanging heat with its environment |
| endotherm | organism that produces its own heat through metabolic processes |
| reptile | ectotherm that is covered with dry scales, breathes with lungs, and reproduces by laying eggs |
| oviparous | reproductive strategy in which the embryo develops outside of the mother's body |
| viviparous | reproductive strategy in which the embryo develops within the mother's body |
| airfoil | surface, such as a bird's wing, whose shape moves air faster over the top than underneath it, allowing for flight |
| sternum | long, flat bone that connects the ribs in front of the chest and to which the chest muscle attaches |
| air sac | air-filled space that connects to a bird's lungs, aiding in breathing |
| mammal | endothermic animal that has hair, mammary glands, bones in the ear that allow for hearing, and a jaw for chewing food |
| mammary gland | gland that produces milk |
| monotreme | mammal whose young compete fetal development in laid eggs |
| marsupial | mammal whose young complete fetal development in a mother's external pouch |
| eutherian | mammal that gives birth to live young that have completed fetal development |
