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: A. QPRS B. SRQP C. QRSP D. SQRP

The correct answer is: D. SQRP

The passage is about how humans have evolved culturally, rather than biologically. The first sentence states that biological evolution has not fitted man to any specific environment. The second sentence then goes on to explain how humans have used their imagination, reason, and emotional subtlety to change their environment, rather than being locked into it. The third sentence then provides an example of this, by talking about how humans have invented new ways to reshape their environment over time. The fourth sentence then concludes by saying that this brilliant sequence of cultural peaks can most appropriately be termed the ascent of man.

The other options are incorrect because they do not follow the logical flow of the passage. Option A, QPRS, puts the second sentence first, which does not make sense because it is a conclusion that relies on the information in the first sentence. Option B, SRQP, puts the third sentence first, which does not make sense because it is an example that relies on the information in the second sentence. Option C, QRSP, puts the fourth sentence first, which does not make sense because it is a conclusion that relies on the information in the second and third sentences.