Answer :

Final answer:

Sharp edges on tools are often referred to as 'cutting edges.' Over time, more sophisticated tools with longer cutting edges were created, increasing their effectiveness. Notably, the Acheulean period tools boasted a more uniform cutting edge.

Explanation:

The sharp edges of many tools are commonly referred to as cutting edges. For instance, ancient humans, one of the earliest known species to develop stone tools, created implements with sharp edges for various jobs, such as cutting, scraping, and chopping tasks. The sharpness of a tool's edge vastly enhances its effectiveness. As time progressed and tool-making techniques advanced, people began to create tools with longer, sharper edges from a more diverse array of materials, including antler, ivory, and bone. For instance, during the Upper Paleolithic era, humans shifted into the blade tool industry creating blades with sharp edges similar to modern knife blades; these blades were known for their efficiency due to their longer cutting edges.

On the other hand, in the Acheulean period, tools were designed with a more refined technique, creating more uniform cutting edges. These tools had two faces, also known as biface, where one end is tapered and the other end is rounded. Tools such as these highlight a significant leap in human engineering ability as they required more cognitive ability and motor skills for their creation.

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