Darwin’s theory of Natural Selection was accepted for a long time but later on, several objections were raised against this causo-mechanical explanation of the origin of new species. Some of the important objections are — 1. Darwin could not distinguish between heritable and non-heritable variations, also, he did not explain the origin of variation. 2.
Our understanding of evolution dates from the publication in 1859 of Charles Darwin’s great book The Origin of Species by Means of Natural Selection, or the Preservation of Favored Races in the Struggle for Life. Before that time, explanation of all the details of animal design in terms of a divine Creator was widely accepted,