Charles Darwin, the British naturalist propounded his popular theory of organic evolution which is popularly known as ''Darwinism''. This theory states that there is the tendency of all the animals to reproduce and continue the race. They all tend to increase the number of their species and this increase in numbe rof their species is always in the geometrical ratio. This theory is known as the theory of over production or the theory of the geometrical ratio of increase. In this point of his theory he has given the example of the fast reproducing animal and the slow reproducing animal. In the fast reproducing animals he has given the example of paramecium. In the slow breeding animal he gave the example of the elephant. According to this theory of over production Darwin explains that paramecium reproduces by the process of binary fission in the favourable condition of the year and gives the two daughter paramecia. Paramecium reproduces four times a day by the process of binary fission. and the total number of daughter paramecia formed in one day are sixteen. Inthe same way if paramecium foes on reproducing in this way for one year and if all the off springs produced in one year survive without death then what will eb the result? The result will be that there will be no place for other animals to live in this world. The space will not be sufficient for only paramecium also.But there is the check and balance system also which is going on in nature.
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