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In this course , you will learn many of the essential principles underlying the chemistry of modern-day life . Throughout human history , people have tried to convert matter into more useful forms . Our Stone Age ancestors chipped pieces of flint into useful tools and carved wood into statues and toys . These endeavors involved changing the shape of a substance without changing the substance itself . But as our knowledge increased , humans began to change the composition of the substances as well - clay was converted into pottery , hides were cured to make garments , copper ores were transformed into copper tools and weapons , and grain was made into bread .
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.