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Which of the following is hypothesized to be the early source of free oxygen in earth's atmosphere? a. photosynthesis by cyanobacteria b. ionization of water molecules c. respiration of fish d. decay of animal remains
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A(n) is a molecule influences the way that a molecule reacts.
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Where is most of the fresh water on earth found a in the ocean b in glaciers and in ice caps c in rivers d in the soil
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Which of the following is hypothesized to be the early source of free oxygen in earth's atmosphere?...
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