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a) The skull size of the early human beings became larger indicating bigger brains. For example
Australopithecus, who lived between 5 and 1 million years ago, had a brain capacity of 530cm3.
Homo erectus who lived later on had an improved brain capacity of between 775 and 1225cm3.
b) Their jaws and teeth became more powerful compared to earlier forms indicating their use in
tearing and cutting tough fibres and even the need for defence as a weapon. The size of the jaws
and teeth became smaller.
c) They developed a refined speech as compared to earlier forms.
d) They were taller with less hair on their body.
e) The forearms and hands underwent some changes. They developed a thumb for grasping
objects. Their arms and hands became shorter, more appropriate for an upright posture.
f) Their leg and foot formation also changed. Their feet and toes were smaller than earlier
hominids in order to support the weight of the rest of the body while motionless or mobile. The
toes were no longer in need for holding onto branches.
ericmunguti answered the question on September 24, 2018 at 06:13
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