Question

The most apparent change during the evolutionary history of Homo sapiens is traced in-
A. Loss of body hair
B. Walking upright
C. Shortening of the jaws
D. Remarkably increase in brain size.

Answer 1

First mammals were shrew(real primate ancestors) , mammals were viviparous and were intelligent to sensing and avoiding danger. When reptiles came down mammals took over this earth due to continental drift.

Complete answer:
The brain capacity showed gradual increase from our early human ancestors. Homo habilis is said to have 650−800c.c, brain capacity which shows increased capacity of around 900cc in Homo erectus. The Neanderthal man is said to be having 1400c.c, brain capacity which further evolved to around 1450 cc, in Homo sapiens sapiens.

Hence, the correct option is option D i.e. remarkably increase in brain size.

Additional Information:
Dryopithecus: Both they were hairy and walked like gorillas and chimpanzees. Dryopithecus were more ape like and Ramapithecus were more man like.
Australopithecus: They were essentially fruit eaters. First ape-man who stood erect and started bipedal locomotion.
Homo Habilis: Tool maker. First human who made tools and weapons from stone. They are herbivores.
Homoerectus: Fire was first used by them. They were omnivorous and were cannabile.
Homosepeins: They used to protect their body. They started a religious procedure like burial of the dead.
Homo sapiens sapiens: Agriculture was started by homo sapiens sapiens. Speech centres were developed. First man who started domestication of animals. First man who started cave painting.

Note: In Apes chimpanzees are most closer to humans than other apes. Protruding jaws were a characteristic feature too. The size of the skull increased leading to increased cranial capacity. As we know with the time and from chimpanzees humans shifted to bipedal movement with gradual loss of hair.