1. Where and how is energy created in the sun's interior? Starting from the center, what are the interior layers that this energy travels through?
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surface modification is a versatile tool and has been widely used in material science and engineering that has significantly facilitated the study and characterization of complex materials. at  matexcel, experienced experts in surface science can offer tailored efforts to meet the specific needs from our clients.

well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."