What according to Darwin, led to the origin of new species ?

According to the Neo-Darwinian theory, which of the following is responsible for the origin of new species

Darwin wrote Origin of Species in

Given : 1 = Natural selection , 2 = Variations and their inheritance , 3 = Survival of the fittest , 4 = struggle for existence According the Darwinism, which of the following represents the correct squence of events in the origin of new species ?

According to Darwin, the organic evolution is due to

What are species?

According of Darwin, the organic evolution is due to

What is variation? How do variations help in the origin of species in evolution?

What is the origin of Ach?

According to the opinion of the scientists the prebiotic Environment of the earth that led to the origin of life was like -

Given:1 - Natural selection, 2 - variations and their inheritance ,3 - survival of the fittest, 4 - struggle for existence.According to Darwin in,which of the following represent the correct sequence of the events in the origin of the new sepecies?