There 13 established theories of evolution viz, i) Oparin’s theory of Origin of Life, ii)Lamarck’s theory Darwin’s theory of natural selection, iii) Darwin’s theory of natural, iv) Haeckel’s Recapitulation theory, v) Modern Synthetic theory (Neo-Darwinism), vi) Sociobiology theory, vii) Chromosomal speciation theory, viii) Shifting balance theory, ix) Punctuated equilibrium theory, x) Allopatric speciation theory, xi) Species selection theory, xii) Neutral Theory, and xiii) Nearly Neutral theory.