Origin of Species by Natural Selection: 

• It was written by Charles Darwin.
• It was a groundbreaking scientific work by British naturalist Charles Darwin.
• It was originally published in 1859.
• Darwin, through his theory, argued, that organisms gradually evolve through a process he called “natural selection.”
• In natural selection, organisms with genetic variations that are better suited to their environment have an advantage over the organisms of the same species that lack the variation.
• And thus, the better-suited organism or specie, are in turn more likely to survive and more likely to give their features to future generations than the other.
• And such, the cycle of natural selection of the specie is carried out during the course of evolution.

Charles Darwin:

• Charles Darwin was born in 1809 in Shrewsbury, England.
• Darwin proposed a theory of evolution called natural selection in the year 1859.
• According to it those populations which are a better fit (reproductively fit) in an environment will be selected by nature and will survive more.
• Darwin's theory of natural selection is popularly known as 'Darwinism'.
• English naturalist Charles Darwin developed the idea of natural selection after a five-year voyage to study plants, animals, and fossils in South America and on islands in the Pacific.
• Darwin conducted a sea voyage in a sailing ship called H.M.S Beagle as a part of his experiments on the theory of evolution.
• Charles Darwin became almost universally thought of as the "Father of Evolution".
• Darwin's process of natural selection has four components:
  • Variation 
  • Inheritance
  • High rate of population growth
  • Differential survival and reproduction
• Charles Darwin died in 1882 at the age of seventy-three.

Thus, Charles Darwin wrote 'Origin of Species'.