52. Long answer questions III

Exercise condition:

5 m.

All the human races like Africans, Asians, Europeans, Americans and others might have evolved from a common ancestor. Provide a few evidences in support of this view.

a. Select the correct statement from the following options.

Asians, Europeans, Americans, and others, may have evolved from a distinct ancestor, but they all share a similar body composition, skeletal structure, physiology, and metabolism.
Asians, Europeans, Americans, and others, may have evolved from a common ancestor because they all share a similar body composition, skeletal structure, physiology, and metabolism.
Asians, Europeans, Americans, and others, may have evolved from a common ancestor, but they all share a different body composition, skeletal structure, physiology, and metabolism.

b. A common ancestor is thought to exist for all humans because ___________.