We all are living being. All microorganisms,plants,animals,etc are considered living beings. Some basic characters such as respiration,nutrition,growth,sensation,reproduction,life span and being dead helps to detect which things possess life. Virus is the living particle and also known as border between living and non-living.It shows living character only when it come in contact of living host.After it, bacteria are unicellular and most primitive organisms which possess single cell which perform as the whole organism and so they are called a cellular.
If we consider the development,life originated from unicellular and converted into multi cellular forms. We can arrange increasing order of life complexity as Bacteria,Protozoans, Fungi, Plants and Animals.
In animals,human being is considered as the most developed and more effective form of life.Humans are being the constructor of the Science and destruct-or of the Environment. Human are very complex form of life but are very peculiar and specific about their position and want to rule over whole universe themselves.
Particularly, one human wants to rule over all human and this selfishness of human claims the life of other living organisms and other men too. People are being so complex in their thinking so that they want to compete with nature which give them life too. So, the complexity of life is being undefinable.
