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X-rays are high-energy electromagnetic waves that can be used in technology but can also be harmful to living things.

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Levels are CK-12's student achievement levels.
Basic Students matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
At Grade (Proficient) Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.
Advanced Students matched to this level are ready for material that requires superior performance and mastery.
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    by CK-12 //at grade
    X-rays and their uses, x-rays as high-energy rays and their dangers.
    This indicates how strong in your memory this concept is
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