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What does a chemical's bioavailability refer to?

Its ability to dissolve in water

Its ability to enter the bloodstream from the environment

A chemical's bioavailability refers to its ability to enter the bloodstream from the environment. This is important because it determines the amount of a chemical that can be absorbed and potentially cause harm to humans and other organisms. Option A is incorrect because while the ability to dissolve in water is a characteristic of a chemical, it does not specifically refer to its bioavailability. Similarly, option C is incorrect as reactivity with other chemicals does not directly relate to a chemical's ability to enter the bloodstream. Finally, option D is incorrect as temperature stability does not play a role in a chemical's bioavailability.

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Its reactivity with other chemicals

Its temperature stability

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