True. Because they are white we know that they reflect light, and thus heat.
Diffusion is the movement of a substance from an area of high concentration to an area of low concentration . Diffusion happens in liquids and gases because their particles move randomly from place to place . Diffusion is an important process for living things ; it is how substances move in and out of cells .
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If I remember correctly, the answer is <span>Friction force.</span>
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