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| Q. |
Bones are pneumatic in - |
| A. | Fishes |
| B. | Amphibians |
| C. | Reptiles |
| D. | Birds |
| Answer» D. Birds | |
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Explanation: Pneumatic boneis is hollow bone filled with air, connected to the respiratory system. Many of a bird's bones are pneumatic, with struts across their hollow interiors to provide a combination of light weight and strength as an adaptation to flying. For flight to occur in Ayes, four physical forces (thrust and drag, lift and weight) must work together. In order for birds to balance these forces, certain physical characteristics are required. Flying birds have evolved reduced weight through several characteristics. |
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