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The answer is letter A.
<span>Organelles and other cellular material are held within a cell by a cellular membrane. These membranes are what consist of a cell's exterior.
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Rocks break down as they interact with air and weather - Weathering
Density differences and other factors cause metals to concentrate in igneous rocks - volcanic activity
Seawater heats up from contact with hot rock, metals dissolves in it, the water rises and contacts cooler water, causing metals ores to settle on the ocean floor - hydro thermal energy
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