(a) It is about the changes in the development of Human brain.
(b) The picture of the last man indicates that the man is wisest of all as his brain is most developed. He ws called as Homo sapiens.
( c) Evolution of the upright man continued in the direction of developing its brain 20 lakh yers age upto this age. Many discoveries were made like fire, practice of agriculture, rearing cattleherds, establishing cities, etc. About 10000 years ago. Cultural development and art of writing developed about 5000 years ago.
Modern sciences and industrial society developed in recent 200-400 years.
