Have you ever wondered why sea-dwelling whales and dolphins need to breathe in open air? Or what really goes on in the more than 70 per cent of our planet covered by water? The answer lies in the inhabitants of the sea who conquered the marine world 3 million years before animals took their first steps on dry land. From tropical waters and icy deserts to coastal shores and the open sea, life in the kingdom of the oceans is extraordinary and always evolving.
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