The brain capacity of $Homo$ $habilis$ was .......

About $P$ million years ago,human-like primates walked in eastern Africa. They were probably not taller than $Q$ feet.
$Q$ is:

The cranial capacity of $Australopithecus$ was approximately ...... .

Which human ancestor first exhibited bipedal locomotion?

Which of the following was most similar to modern man?

Currently,the mitochondrial $DNA$ $(mt-DNA)$ sequence and the $Y$-chromosome are considered for the study of human evolution because ........