All living organisms are composed of units called cells. The simplest organisms are made from single cells but more complex plants and animals, are multicellular, composed of millions of cells.
In a multicellular organism there are many different types of cells, with different structures. They are specialized so that they can carry out particular functions in the animal or plant. Despite all the differences, there are basic features that are same in all cells.
There are eight life processes which are common to most living things.