explain that all living organisms grow.
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Cells are the smallest units that satisfy all conditions necessary to be called living--they use energy, reproduce without aid of a host organism, pass on their genetic material, respond to their environment and are able to regulate their physical condition to adapt to the environment. Some structures, like viruses, share some but not all characteristics of cells; therefore they are not alive.
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Every living organism begins life as a single cell .unicellular organism Stay as one cell but they grow too . multicellular organism add more and more cells to form more tissue and organs as they grow .Growth and development of living organism are not same thing .
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