During the early stage of life, early human can easily find rock as the means and ways for hunting, building houses, making fire, etc. Compared to wood, rock is stronger as you look at it. Stone has been widely used in variety of tools such as spear points, arrow heads. The accessibility of rock is greater than any other materials.
The answer is C.) increased turbidity
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Design the layout of a development
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The light rays come to a sharp focusing point on the retina. The retina functions much like the film in a camera. ... The retina receives the image that the cornea focuses through the eye's internal lens and transforms this image into electrical impulses that are carried by the optic nerve to the brain.