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Waves interact with matter in several ways. The interactions occur when waves pass from one medium to another. Besides bouncing back like an echo, waves may bend or spread out when they strike a new medium. These two ways that waves may interact with matter are called reflection and refraction .
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The scientific method<span> is a body of techniques for investigating phenomena, acquiring new knowledge, or correcting and integrating previous knowledge. To be termed </span>scientific<span>, a </span>method<span> of inquiry is commonly based on empirical or measurable evidence subject to specific principles of reasoning.</span>
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Biological membranes have three primary functions: (1) they keep toxic substances out of the cell; (2) they contain receptors and channels that allow specific molecules, such as ions, nutrients, wastes, and metabolic products, that mediate cellular and extracellular activities to pass between organelles and between the
