Rebecca L. Johnson Books

Cells
Cells

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Cells
Cells

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Properties of matter
Properties of matter

By Rebecca L. Johnson

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An introduction to the connection between matter and atoms, elements, and compounds.

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Chemical Changes
Chemical Changes

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Chemical Changes
Chemical Changes

By Rebecca L. Johnson

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If you’ve ever purchased a product online or in a store, you’ve likely come across a barcode. Behind these barcodes lies a standardized system that makes modern commerce possible. Two key codes often encountered are the EAN (European Article Number) and ISBN (International Standard Book Number). But what are they, how are they connected, and why are they so crucial? Let’s explore.

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