Passive margin deposits are rare or absent during the Proterozoic and thereafter.
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Q9: Banded iron formations precipitated in oxygen-rich ocean
Q10: Fortunately for life, oxygen levels in the
Q11: Glaciers were rare during the Proterozoic, as
Q12: Both the presence of banded iron formations
Q13: Orogens are belts of igneous and metamorphic
Q15: The Ediacaran fauna of Australia includes many
Q16: A eukaryotic cell has a well-defined nucleus
Q17: The Ediacaran fauna of Australia is an
Q18: The primary source for free oxygen introduced
Q19: Eukaryotic cells have a nucleus and other
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