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The bilateral organism crawled on the seafloor, taking in organic matter at one end and dumping the remains out the other some 555 million years ago.
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By Scientific American4.2
599599 ratings
The bilateral organism crawled on the seafloor, taking in organic matter at one end and dumping the remains out the other some 555 million years ago.
Learn more about your ad choices. Visit megaphone.fm/adchoices

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