Ans. Huxley explained the origin of man in his book ‘ The man’s place in nature’.Humans are a member of order primates of class mammalia.Primates originated 80-100 million years ago in the Pliocene epoch of the Cenozoic era.Primates originated from elephant shrews but they were not real primates. Apes have 48 number of chromosomes whereas 46 number of chromosomes.DNA content and DNA matching is the same in both apes and humans.Homo habilis were the first human- like species as their fossils were discovered by Dr. Leakey from two million years old rocks in Africa. Their cranial capacity is about 650-800 c.c.Homo erectus were direct ancestors of homo sapiens. They are also called java man and their cranial capacity is 800-1000 c.c. They were the first man who used fire for hunting, protecting and cooking. Their origin and evolution, 1.5-2 million year ago.Homosapiens origin and evolution before 40,000- 1 lakh year ago.Fossils of homosapiens were discovered by C.fuhlrott from the Neanderthal valley of germany.