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Cells are the basic structure and functional unit of all organisms. Cells are building blocks that create life. All living organisms on earth are divided into cells. Living things may be single celled or they may be very complex, like human beings. In larger organisms the main purpose of a cell is to organize. Cells hold a variety of pieces and each cell type has a different purpose. Plant cells are easier to identify than animal cells because they have a cell wall made of cellulose. Cells are very unique to each type of organism. If you look at very simple organisms you will discover that their cells have no defined nucleus and other cells that have hundreds of nuclei.