Cells are structural and functional units of an organism. That means the cell is the main constituent as well as the smallest unit that performs the life activity of an organism. Here are The Prokaryotic Cell: Definition, and Parts – Functions

The body of the living creature consists of an organ system, whereby the organ system is composed of organs, organs formed by tissues, and tissues formed from cells. Basically every living creature has a cell that is the basic constituent of the body of living beings. What Are Cells? Here are The Definition, Hystory, and Types