Production of the first free oxygen in the atmosphere caused organisms living at that time to flourish.
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Q5: The Earth's crust solidified around 4.5 billion
Q31: Anaerobic organisms require oxygen to survive.
Q33: Heterotrophic organisms manufacture their own food using
Q34: The four principle oceans of the Earth
Q35: Earth developed the first ocean by about
Q37: Radiometric age dating is used to determine
Q38: When the Earth cooled, the layers of
Q40: The correct arrangement of astronomical bodies from
Q41: The "Age of Discovery" began with:
A) Christopher
Q44: The nebular hypothesis suggests that:
A)all bodies in
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