karlachavez474 karlachavez474
  • 25-04-2024
  • Geography
contestada

Stromatolites are important because:(select two answer)
a. they are a dominant form of life for most of the Proterozoic
b.they were built by photosynthesising organisms that contributed O2 to the atmosphere
c.they are the only way to date Precambrian sedimentary rocks
d.they built reefs together with corals in the mid-Paleozoic

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