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Why do small fish not have hearts?

Updated: 8/9/2023
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15y ago

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Fish live underwater, where there is no air to breathe. They have evolved gills to extrect dissolved oxygen from water. Fishes do not have lungs as it cannot filter air from water like gills, therefore, if fishes had lungs, their lungs would be filled with water, making them unable to breathe and survive.

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15y ago
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15y ago

All animals have hearts. Smaller the animal smaller the heart. With smaller animals their heart beat for fast. For elephants it is slow.

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14y ago

Really? My question for you: Why do you have a heart?

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Q: Why do small fish not have hearts?
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