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The basics: plants, animals and the world around you.

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The human body: cells, organs and systems.

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Chemistry of life, cells and tissues.

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Classification, life processes and ecology.

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DNA, genetics and evolution — exam ready.

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Fact of the weekWeek 36
Did you know?

An octopus has three hearts — and blue blood.

Two hearts pump blood through the gills, the third sends it round the body. Their blood uses copper instead of iron, which turns it blue.

AnimalsCirculation
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