Life
Ocean life surged 500 million years ago due to cooler sea temperatures
A fall in sea surface temperatures around 500 million years ago led to the evolution of aquatic life that could survive in newly hospitable environments
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A fall in sea surface temperatures around 500 million years ago led to the evolution of aquatic life that could survive in newly hospitable environments
Male harbour seals use vocalisations to woo females and they appear to learn these songs years before they need them