Geological evidence for the most primitive mammal is found in

Which of the following is considered a connecting link between man and ape?

Primates which existed about $15$ million years ago were:
$(I)$ Dryopithecus
$(II)$ Homo habilis
$(III)$ Ramapithecus
$(IV)$ Australopithecus
$(V)$ Homo erectus
$(VI)$ Neanderthal man
Choose the correct option.

What were the brain capacities of $Homo$ $erectus$ and $Neanderthal$ man,respectively?

Which ancestor of man first exhibited bipedal gait?

There are two opposing views about the origin of modern man. According to one view,$Homo$ $erectus$ in Asia were the ancestors of modern man. $A$ study of $DNA$ variation,however,suggested an African origin of modern man. What kind of observation on $DNA$ variation could suggest this?