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Democritus said that atoms cant be broken down into smaller pieces.
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Aristotle hypothesized that matter can be broken down into smaller pieces.
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Democritus hypothesized that all matter is made up of many tiny discrete particles called atoms which are too small to be seen.
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Hypothesized that matter has a continuous composition that can be broken down into smaller pieces.
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John Dalton was a good student at school and studied well. He is now known as the father of atom.