All living organisms must carry out some functions such as metabolism, waste excretion, growth, reproduction, etc. These organisms could be as complex as a human being or a plant or can be as simple as a cell. All the life is composed of cells, thereby cell the basic unit of life. A cell is capable of carrying out all the basic functions that living organisms must carry out. This is made possible by use of cell organelle. In comparison, living organisms (multi-cellular organisms) have complex systems (consisting of organs, tissues, cells, etc.) to carry out these activities. The organelle of cells are analogous to organ systems in multicellular organisms. For example, multicellular organisms undergo sexual reproduction and produce another identical organism. Cells also divide and produce another cell.
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