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Multiple sclerosis

Ocean deoxygenation

Marine biogeochemist Hannah Whitby explains how our actions are causing oceans to lose oxygen, which is impacting the balance of marine ecosystems

A billfish hunting in the well-oxygenated waters of Baja California
© Blue Planet Archive/Alamy Stock Photo

AQA Energy and ecosystems

OCR A Ecosystems; Populations and sustainability

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Multiple sclerosis