Well the cell is the basic structural, functional biological unit of every living organism. It is the smallest organism that´s considered living, except viruses. Cells are often considered the building blocks of life. Cells are made up of protoplasm's contained inside a membrane which contains small molecules such as proteins and nucleic acids.
The number of cells inside plants and animals varies whilst humans contain up to 100 trillion cells. The cell was first discovered by Robert Hooke in 1665, much later on cells theory was developed stating that all organisms are composed of more than one cell and that all cells come from pre-existing cells.
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