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GWMMS Birds Ch. 12
| Question | Answer |
|---|---|
| bird | An endothermic vertebrate that lays eggs and has feathers and a four-chambered heart. |
| contour feather | A large feather that helps give shape to a bird’s body. |
| down feather | A short, fluffy feather that traps heat and keeps a bird warm. |
| crop | An internal organ of many birds that stores food. |
| gizzard | A muscular, thick-walled part of a bird’s stomach that squeezes and grinds partially digested food. |
| lift | The difference in pressure between the upper and lower surfaces of a bird’s wings that produces an upward force that causes the bird to rise. |
| mammal | An endothermic vertebrate with a four-chambered heart and skin covered with fur or hair, that feeds its young with milk from the mother’s body. |
| diaphragm | A large muscle located at the bottom of a mammal’s rib cage that functions in breathing. |
| marsupial | A mammal whose young are born at an early stage of development, and which usually continue to develop in a pouch on their mother’s body. |
| placental mammal | A mammal that develops inside its mother’s body until its body systems can function independently. |
| mammary gland | An organ in female mammals that produces milk for the mammal’s young. |
| monotreme | A mammal that lays eggs. |
| gestation period | The length of time between fertilization and birth of a mammal. |
| placenta | An organ in pregnant placental mammals that passes materials between the mother and the developing embryo. |
Created by:
mrs-edgar
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