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All living things need oxygen to stay alive. They use oxygen to turn food into energy. To obtain oxygen from the air, animals and plants exchange gases between themselves and their surroundings. |
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All living things need oxygen to stay alive. They use oxygen to turn food into energy. To obtain oxygen from the air, animals and plants exchange gases between themselves and their surroundings. |
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Some obtain oxygen by breathing through lungs. Mammals, such as dogs, cats, cows and ourselves, obtain oxygen this way. |
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| Some animals, such as fish, which live under water, obtain oxygen using gills. |
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| Some animals, such as insects, use breathing tubes called trachea. |
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| Some animals, such as worms, obtain oxygen through the surface of their skin.skin. |
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Green plants exchange gases with their surroundings through holes in the under-surface of their leaves. These holes are called stomata. |
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