Modern stromatolites – living fossils. Originating over 3 billion years ago, stromatolites are the oldest known fossils (timeline). Fossilized stromatolites were laid down as colonial structures built by photosynthesizing Cyanobacteria and other microbes.
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I have been to get a
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I c have a true conclusion for my head but I think it is a good way for me to get
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The right atrium takes blood from the veins and pumps it into a ventricle
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