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Atoms of two or more substances that are physically blended but not chemically bonded together form a ________

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Prior to 1960, Lake Washington was highly polluted and underwater visibility was limited to one or two meters. In the late 1960s, a large cleanup effort reduced pollution, resulting in visibility that increased to six to seven meters by 1976. Which of the following best explains how the change in underwater visibility affected armor plating in Lake Washington sticklebacks between 1957 and 1976?AHigher visibility allowed sticklebacks to increase their food consumption to make armor production easier.BHigher visibility made the sticklebacks more susceptible to large-toothed predators in the lakes, giving complete armor a selective advantage.CClearer water allowed sunlight to penetrate to deeper depths, so the sticklebacks had to increase the amount of armor to protect themselves from the resulting increase in water temperature.DClearer water contained fewer of the molecular building blocks needed for armor production, so sticklebacks showed a reduction in the amount of armor.

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