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Chemistry 79 Online
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? 8000 BC – 1000 BC 1000 BC – 450 BC 300 BC – 1400 AD 1774 – 1794 AD Time period 1 Time period 2 Time period 3 Time period 4

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