the smallest functional unit of life is called cell

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The smallest functional unit of life is called cell. Respiration is the continuous process of supplying oxygen to cells and tissues of the body from the environment and the removal of carbon dioxide from the tissue to the environment. The continuous movement of blood through an organism to supply the nutrients and oxygen and to remove waste product is called blood circulation.

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The smallest functional unit of life is called cell. Respiration is the continuous process of supplying oxygen to cells and tissues of the body from the environment and the removal of carbon dioxide from the tissue to the environment. The continuous movement of blood through an organism to supply the nutrients and oxygen and to remove waste product is called blood circulation.