Black smoke rises in the air from a factory in georgia. the black smoke is a pollutant. when this pollutant returns to earth it becomes acid rain. how does the acid rain change the plants' and animals' environment?

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so, when you eat, your teeth chew and grind food into smaller pieces. this is mechanical digestion. then reactions aided by digestive enzymes break down large food molecules into smaller molecules. this is chemical digestion. the two processes change the food into simpler substances that can be used by the body for raw materials and energy.

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tobey

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