Final answer:
Democritus initially proposed the concept of atoms, but John Dalton solidified the hypothesis with quantitative measurements, forming the basis of the atomic theory.
Explanation:
Democritus was the philosopher who first came up with the idea that matter was made up of atoms. However, it was John Dalton, a British schoolteacher in the early nineteenth century, who supported this hypothesis with quantitative measurements, leading to the development of his atomic theory that all elements are composed of atoms.
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