Read the carefully passage given below and answer the questions that follow:
Man cannot work in vacuum. It is his needs and necessities that force him into work. It is inherent in man's nature that he gets ignited by challenges and obstacles. These challenges come from his needs and necessities. The shelterless men and women originally walked in rains and heat. The necessity of a dwelling place was felt. First they ousted the animals from mountains caves and began living in them. Then on the model of the cave they devised stone hutments. This necessity thrusted them on the result has been forts, castles and skycrapers of our day. Man's necessity to remain healthy forced him into medical science. This led to the inventions of the skill implements and medicines we have today. In fact the needs and necessities of man have thrust him into inventions and innovations in various fields. It is from the womb of our necessities that all our inventions and innovations have been born.
Questions :
(a) Who walked in rains and heat?
(b) How did the men devise stone hutments?
(c) What forced a man to go to medical science?
(d) What is inherent in man's nature?
