The buildup of cyanobacteria entrapping sand grains explains the origin of stromatolites.
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Q11: All known Proterozoic animals were soft-bodied.
Q12: Stromatolites are the product of organic activity.
Q84: The transition from single to multi-celled organisms
Q85: Banded iron formations,although rich in iron,are not
Q86: In order for monomers to polymerize,they need
Q88: The oldest stromatolites are 4.1 billion years
Q90: The Sudbury Basin was the site of
Q91: Proterozoic layered igneous complexes are important sources
Q92: Stromatolites are the first life form with
Q93: Material such as chitin may have formed
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