Free oxygen was present in the Earth's primordial atmosphere.
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Q31: Anaerobic organisms require oxygen to survive.
Q32: Earth developed the first ocean by about
Q33: All of the following are characteristics of
Q34: In general, the salinity content of ocean
Q35: The largest of the ocean basins, which
Q37: The European "Age of Discovery" began with:
A)Christopher
Q38: Oceanic crust is less dense than continental
Q39: The average depth of the world's oceans
Q40: Heterotrophic organisms can make their own food
Q41: A tentative, testable statement about the general
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