Living organism are highly complex and organized. This complexity and organization is composed of grading of structures with each level based on the one below it, and providing the foundation for the one above it. Life is built on a chemical foundation. This foundation is based on elements, each of which is a unique type of matter. As we know, and atom is the smallest possible unit of an element, which retains all the properties of that element, Further division of this unit produces isolated subatomic particles of which an atom is composed. Atoms may combine in specific ways to form molecules. Simple molecules are formed spontaneously. for example, carbon dioxide. Extremely large and complex molecules are manufactured by living matter ( within the bodies of living organism) The molecules of living matter are mostly based on carbon and provide building blocks of living matter. These are called Organic Molecules. Molecules of different elements comprise a Compound. Along with organic compounds, Inorganic compounds (minerals) are also associated with living organism,for example Human Blood.
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