give the statement of cell theory.
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Cell theory is a scientific theory which describes functions of a cell.
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they make a net work of fine tubes in organs which provide a very large surface area between the blood and the tissues in the organs this surface area allows large amount of substance ,such as oxygen and glucose to pass between the blood and the tissues in the organs this surface area allows large amount of substance ,such as oxygen and glucose to pass between the blood
and the tissues in a short amount of time when the blood moves away from ,it travels along a larger blood vessel called the pulmonary veins
and the tissues in a short amount of time when the blood moves away from ,it travels along a larger blood vessel called the pulmonary veins
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