The cell, unit of life
The cell (from the Latin cellula, diminutive of cella ,"hollow") is the morphological and functional unit of all living beings. It is the smallest part that can be considered as having life, since it can perform the three vital functions of living beings: nutrition, relationship and reproduction.
All the living creatures are formed from cells. Some single-celled organisms are made up of a single cell. Others, multicellulous organisms are made up of many cells.