Life and Death in ancient seas

The oceans were the cradle of life on Earth for billions of years
before our ancestors took to the land and air. But they have also
seen some of the most devastating mass extinctions in geological
history. In this month's Naked Oceans we find out about the bizarre
evolutionary experiments that appear in the first explosions of
complex life over 600 million years ago, and what may have driven
the catastrophic End Permian extinction event, and how it could
teach us about potential future ocean extinctions. Plus we ask
another marine expert to choose our Critter of the Month... For
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