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The Miller–Urey experiment

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Evolution in your garden

The placenta

The placenta is a temporary organ that develops inside the uterus alongside the growing fetus. Reproductive scientist Kirsty McIntyre explores how nutrients reach the fetus via the placenta during pregnancy, and highlights the need to understand this fascinating organ

AQA Transport across cell membranes; Surface area to volume ratio

Edexcel A Properties of exchange surfaces

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Previous

The Miller–Urey experiment

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Evolution in your garden

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