In each question, the first and the last sentences of the passage are numbered S1 and S6 respectively. The rest of the passage is split into four parts. These four sentences are jumbled. Read the sentences and identify their correct and logical order.

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S1: Biological evolution has not fitted man to any specific environment.
P : It is by no means a biological evolution, but it is a cultural one.
Q : His imagination, his reason, his emotional subtlety and toughness, makes it possible for him not to accept the environment but to change.
R : And that series of inventions by which man from age by age has reshaped his environment is a different kind of evolution.
S : Among the multitude of animals which scamper, burrow swim around us he is in the only one who is not locked in to his environment.
S6: That brilliant sequence of cultural peaks can most appropriately be termed the ascent of man.
The Proper sequence should be: