Evidences and Theories of Evolution



  • Conventional religious literature proposed the theory of special creation, suggesting that all living organisms were created as they are today.
  • Charles Darwin's observations during his voyage on the H.M.S. Beagle challenged these ideas in the 19th century.
  • Darwin's theory of evolution asserts that existing life forms share similarities with past forms, and there has been gradual evolution over time.
  • This note explores the evidence and the theory of evolution as developed by Charles Darwin and Alfred Wallace.

 Natural Selection and Evolution:

  • Darwin concluded that populations have built-in variations in characteristics.
  • Individuals with characteristics suited to their environment (greater fitness) are more likely to leave more offspring.
  • Natural selection is the mechanism through which better-fit individuals survive and pass on their traits to the next generation.

 Common Ancestry and Geological History:

  •  All existing life forms share similarities and common ancestors.
  • These ancestors lived in different periods of Earth's history (epochs, periods, and eras).
  • The geological history of Earth closely correlates with the biological history, supporting the idea that Earth is billions of years old. 


  • The theory of evolution proposed by Charles Darwin and independently by Alfred Wallace revolutionized our understanding of life on Earth.
  • It is based on the principle of natural selection and the idea that all life forms share common ancestors.
  • The evidence for evolution, including the geological history of Earth, strongly supports the concept of an ancient Earth and the gradual development of life.