(d) : The most apparent change during evolutionary history of modern man (Homo sapiens) is the increase in the brain size. The brain capacity gradually increased from early human ancestors. Homo habilis had $650-­800\ c.c.$ brain capacity which increased to $900\ c.c.$ in Homo erectus. The true men including the living modern man also displayed the gradual increase in cranial size. The neanderthal man had $1400\ cc$ brain capacity which evolved to around $1450\ c.c.\ (1300 -1600\ c.c.)$ in living modern man (Homo sapiens sapiens).