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| Q. |
Who among the following have venous heart? |
| A. | Mammals |
| B. | Reptilians |
| C. | Fishes |
| D. | Amphibians |
| Answer» C. Fishes | |
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Explanation: There are over 20,000 species of fish, divided into three groups : bony fish, cartilaginous fish and jawiess fish. Bony fish, which are the most numerous, have skeletons, of bone, and swimbladders (gas-filled organs) to keep them afloat. Cartilaginous fish, such as sharks, rays and raffish, are mostly marine hunters; they have skeletons made of cartilage and sandpaper-like skin. The primitive jawless fish have sucker-like mouths, and include lampreys and hagfish. |
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