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OpenStudy (anonymous):
In which time period did Ancient Greek philosophers propose that all matter was composed of four fundamental substances: earth, air, water, and wind? Time Period 1 - 8000 BC – 1000 BC Time Period 2 - 1000 BC – 450 BC Time Period 3 - 300 BC – 1400 AD Time Period 4 - 1774 – 1794 AD
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