Final answer:
Pure substances, in Chemistry, consist of single elements or compounds that have a consistent composition.
Step-by-step explanation:
Pure substances, in the field of Chemistry, are indeed made up of single elements or compounds. A pure substance refers to a material that has a consistent and homogeneous composition. Elements are substances that cannot be broken down into simpler substances by chemical means, such as iron or oxygen. Compounds, on the other hand, are substances made up of two or more elements chemically combined, such as water (H2O) or sodium chloride (NaCl).
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