Question

Two million years ago, the first stone tools enabled our ancestors to

Answer 1

 to gain some control within their surroundings. 

Answer 2

The correct answer is Gain some control over their relationship to their surrounding. This means that they could hunt much much easier, they could also make better tools for making better tools and weapons, they could also make tools to develop agriculture, they could do whatever they wanted, or at least what was possible with stone.