Which is the smallest unit of life in living organism?

cell

The cell is the smallest structural and functional unit of living organisms, which can exist on its own. Therefore, it is sometimes called the building block of life. Some organisms, such as bacteria or yeast, are unicellular—consisting only of a single cell—while others, for instance, mammalians, are multicellular.

it takes hundreds of years to become stable.

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that is true   : ) hope this you