Option b. The first recognizable ancestors of the lineage leading to humans are: sahelanthropus tchadensis.
What is the sahelanthropus tchadensis?
In the family tree of humans, this is the oldest known specie of humans that have existed on the earth. They are regarded as the ancestors of mankind.
Science have it that they have existed on earth around the period of 6 million years to about 7 million years ago. This specie must have possessed the ability to walk thus aiding its survival through the regions that they existed.
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