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A substance composed of two or more elements in a fixed, definite proportion is
a.a homogeneous mixture.
b.a heterogeneous mixture.
c.a compound.
d.a solution.
e.an alloy.

Respuesta :

joannechan00oswszy
a compound

(i think) because it consists of two + elements, whose ratios are shown clearly in the chemical formula, meaning it has a fixed, definite proportion. 

hope that helps :)

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