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What is urban runoff?

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Urban runoff is a source of water pollution that includes oil and gasoline discharge from automobiles and storm sewer discharge.

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What does the Law of Conservation of Mass state?

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The Law of Conservation of Mass states that mass is neither created nor destroyed in a chemical reaction. An example is the equation @@2H_2 + O_2 ightarrow 2H_2O@@.

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How can genetic variation occur due to environmental changes?

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Genetic variation may result from environmental changes, such as an arctic fox changing its color over time when migrating to a different climate.

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What is the Law of Superposition?

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The Law of Superposition states that in undisturbed layers of rock, the oldest layers are at the bottom and the youngest are at the top.

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Which group of elements does chlorine most readily bond with?

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Chlorine, which has 7 valence electrons, most readily bonds with elements in group 1.

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What is the definition of valence electrons?

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Valence electrons are the electrons in the outermost shell of an atom that are involved in forming bonds.

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What is the significance of recent changes in species found in rock layers?

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Recent changes in species found in rock layers provide evidence for the theory of evolution and support the Law of Superposition.

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What is the relationship between cell theory and the theory of evolution?

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Cell theory states that all living things are made of cells, while the theory of evolution explains how species change over time. Both concepts are fundamental to understanding biology.

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What is an example of urban runoff?

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An example of urban runoff is the discharge of oil and gasoline from vehicles into storm drains.

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What is the chemical equation for the formation of water?

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The chemical equation for the formation of water is @@2H_2 + O_2 ightarrow 2H_2O@@.