The cell is the smallest unit that can display all the characteristics of life.
Cells are the smallest units of life that can divide, multiply, grow and respond to environmental stimuli. The cell structure is colloidal. It is the smallest unit that can live on its own and is the building block of all living organisms and body tissues. Cells are composed of three main parts: membrane, nucleus and cytoplasm. The cell membrane surrounds the cell and controls substances entering and leaving the cell. The nucleus is an cellular structure that contains the nucleolus and most of the cell's DNA and this is where most RNA is made. Cytoplasm is the fluid which is inside the cell .
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