16.
S1: Palaeobotany is the study of fossil plants preserved in rocks dating back in millions of years.
P : Records of the history of the world are contained in fossils.
Q : Through the ages, plants have evolved from simple to more complex forms.
R : First there were water plants then land plants appeared during the Paleozoic era.
S : But since the fossil remains appear locked in rock layers, they are closely related to the geologist area of investigation.
S6: The fossil plants indicate the age of the rock, and also point to facts regarding climate, temperature and topography.

The Proper sequence should be:

17.
S1: On vacation in Tangier, Morocco, my friend and I sat down at a street cafe.
P : At one point, he bent over with a big smile, showing me, a single gold tooth and a dingy fez.
Q : soon I felt the presence of someone standing alongside me.
R : But this one wouldn't budge.
S : We had been cautioned about beggars and were told to ignore them.
S6: Finally a man walked over to me and whispered, "Hey buddy this guy is your waiter and he wants your order".

The Proper sequence should be:

18.
S1: And then Gandhi came.
P : Get off the backs of these peasants and workers, he told us, all you who live by their exploitation.
Q : He was like a powerful current of fresh air, like a beam of light, like a whirlwind that upset many things.
R : He spoke their language and constantly dre their attention to their appalling conditions.
S : He didn't descent from the top, he seemed to emerge from the masses of India.
S6: Political freedom took new shape and then acquired a new content.

The Proper sequence should be:

19.
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:

20.
S1: The dictionary is the best friend of you task.
P : That may not be possible always.
Q : It is wise to look it up immediately.
R : Then it must be firmly written on the memory and traced at the first opportunity.
S : Never allow a strange word to pass unchallenged.
S6: soon you will realize that this is an exciting task.

The Proper sequence should be:

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