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Subsequently , they began to separate and use specific components of matter . A variety of drugs such as aloe , myrrh , and opium were isolated from plants . Dyes , such as indigo and Tyrian purple , were extracted from plant and animal matter . Metals were combined to form alloys - for example , copper and tin were mixed together to make bronze - and more elaborate smelting techniques produced iron . Alkalis were extracted from ashes , and soaps were prepared by combining these alkalis with fats .
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.