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Answer:
1. houses- 20 years before there were only about 100 houses but only kucha houses.but at present there are more than lakhs of houses and pucha houses and buildings have been developed.
2.transport-there were almost cartwhelersand bullock carts .and at present there are more than crores of vehicles.
3.mode of communication- before 20 years there were only telephonesand at present there are iphones,ipad,tabs,phones
4.food habits -before 20 years people eat rice chapattis and healthy food but at present people are eatingunhealthy food like pizzas burgers pepsi cold drinks