‘When you have exhausted all possibilities, remember this – you haven’t.’ –Thomas Edison

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Acoels, which are thought to be older than both Protostomes (mouth develops before the anus) and Deuterostomes (anus first). But now a team of evolutionary biologists is suggesting that Acoles belong within the group of Deuterostomes. This even though Acoles don’t have a separate mouth and anus at all, but an opening that serves both functions.

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