Introduction to Cells

Cell is the basic unit of living organisms that are aggregates of all the essential
characteristics of life yet it is not the basic unit of things because cell itself is made up of
diverse molecules and atoms. Cells have characteristics of life such that they can
reproduce offspring, respond to change in environment, breathing in and out,
transformation of intake of nutrients from outside into energy, waste disposal,
homeostasis, growth and reproduction. From the standpoint of cellular theory, all cells
arise only by division of a previously existing cell and all living organisms are composed
of basic unit of cell.