Proterozoic (noun) Definition, Meaning & Examples

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noun
  1. the longest geologic eon and the most recent division of Precambrian time, during which the presence of oxygen in Earth’s atmosphere became significant, causing certain life forms to adapt to the use of oxygen and leading to a proliferation of complex multicellular life.
adjective
  1. of or relating to this eon.
noun
  1. the later of two divisions of the Precambrian era, during which the earliest plants and animals are assumed to have lived
adjective
  1. of or formed in the late Precambrian era
    Proterozoic (noun) Definition, Meaning & Examples

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