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A student needs to find the mass of an atom. The numbers of which atomic particles determines the mass of the atom?

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Which color shirt will reflect the most light on a hot, sunny day?

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The theory of spontaneous generation was eventually disproved scientifically by

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The Florida Bog Frog (Lithobates okaloosae) inhabits shallow stream overflows in three counties in Florida. With such a small geographic habitat, any change in the frog's environment could cause drastic changes in the population. Which would most likely affect the frog population if acid rain changed the pH of the water?