Contaminants from farmland, factories, and cities Can runoff into our rivers. Chemicals like nitrogen and phosphorus can produce eutrophication. To help preserve the cleanliness of our water, we can reduce the use of fertilizers and other containments.
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The answer is letter a. Being subjected to immense heat and the experience of pressure due to being far below the Earth's surface can change igneous or sedimentary rocks to metamorphic rocks.
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Thylakoids, which are chloroplasts in the mesophyll cells of a leaf
