Bronze is a mixture of copper and tin. It is made by combining the two elements in a specific proportion and allowing the atoms to mix evenly. Although the ratio of copper to tin can vary from one sample of bronze to another, the ratio is the same throughout any given sample.Bronze is

A homogeneous mixture has a uniform composition throughout a given sample. The question says copper and tin mix evenly and their ratio stays the same throughout each sample, so bronze is homogeneous. The ratio may differ between samples without making an individual sample heterogeneous.

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