Titlebook: Mastering Science; Robert Barrass Textbook 1991Latest edition Macmillan Publishers Limited 1991 community.energy.environment.evolution.gen

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Light and seeing,magine light spreading from the point source in all directions, as rays, in straight lines. However, in a diagram (such as Figure 17.1) only those rays needed to show the position of the shadow are represented.

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The use of matter and energy in your body,9.2), your small intestine has a very large surface area of epithelial cells absorbing the products of digestion. When molecules absorbed after digestion become part of the cells and tissue fluids of your body, they are said to have been assimilated.

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