It was'nt until the 16th century that a geometric mathematical model of heliocentric system was presented <span> by a Renaissance mathematician, astronomer, </span><span>Nicolaus Copernicus
</span>Nicolaus Copernicus <span>leading to the Copernican Revolution
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The liquid is blue is an example of qualitative data. Qualitative data is data that can not be represented by numbers. The volume and density are both quantitative data.
It is OH- (hydroxide ion)
