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The law of conservation of energy -LRB- which says that energy can change form but is never lost -RRB- ties together such topics as food calories , batteries , heat , light , and watch springs . Understanding this law makes it easier to learn about the various forms energy takes and how they relate to one another . Apparently unrelated topics are connected through broadly applicable physical laws , permitting an understanding beyond just the memorization of lists of facts . The unifying aspect of physical laws and the basic simplicity of nature form the underlying themes of this text . In learning to apply these laws , you will , of course , study the most important topics in physics .
Please check all the words that can be used instead of the target word in the same context. Note that the morphology of the target (third person singular, past tense etc.) is considered to be applied to the candidate automatically in the process of paraphrasing.