Which statement most accurately describes smooth er? a. series of membrane-enclosed sacs that detoxify substances and synthesize lipids and carbohydrates b. stack of flattened sacs that modify and sort proteins c. contain(s) digestive enzymes d. series of membrane-enclosed sacs with ribosomes on the surface

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Explanation:

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answer:

convection currents in the magma drive plate tectonics. heat generated from the radioactive decay of elements deep in the interior of the earth creates magma (molten rock) in the aesthenosphere. the aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the earth that extends to 2900 km.