The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.
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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Adolescents often feel clumsy during puberty because during this time of development, their hands and feet grow faster than their arms and legs do. The body is therefore out of proportion. One out of five adolescents actually experiences growing pains during this period.
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The average adult has about 21 square feet of skin.
Plant cell-to-cell junctions known as middle lamella
Diagram of a cell nucleus
Blood-typing and cross-reactions: The blood type depends on the presence of surface antigens (agglut