Sports persons expend a lot of energy and, therefore, larger amount of water is evaporated from their bodies. To prevent dehydration they should drink more water.

Sports persons expend a lot of energy and, therefore, larger amount of water is evaporated from their bodies. To prevent dehydration they should drink more water.
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root hairs | Xylem | Urethra |
arteries | Kidneys | Veins |
atria | Capillaries | Heart |
ureter | Phloem | Urinary bladder |