It is well known that during the Cambrian period (starting around 540 million years ago) there was an 'explosion' of different forms of life, traits of which can still be seen in the world today. But what came before?
The answer is the creatures of the Ediacara era. Simple multicellular organisms without mouth (or anus!), sponges and the like.
In Radio 4's In Our Time a panel of experts discuss the biota, the climate that influenced it and many other factors. It's a fascinating program and well worth giving a listen if you've got a spare 45 minutes.
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