The question consists of six sentences of a passage. The first and sixth sentences are given as S1 and S6. The middle four sentences in each have been jumbled up and labeled as P, Q, R, and S. Find the proper sequence of the four sentences and mark your response accordingly.

S1: Human evolution is intimately related to the origin of life and its development on the face of the earth. 

P: The first successful formation of protoplasm initiated life and its continuous development proceeded towards complexity to give rise to different life forms of evolved types.

Q: Since then evolution denotes a change, although the term may be defined in several ways.

R: In the context of man, biological evolution started with the ‘Origin of life’.

S: The term evolution was first applied by the English philosopher Herbert Spencer to mean the historical development of life.

S6: Philosophers, Thinkers, and Scientists all submitted their varied thought and propositions regarding the nature and mechanism of the origin of life on earth.