What caused the composition of earth’s early oceans to transition from dissolved carbon dioxide to dissolved oxygen? a. ultraviolet rays from the sun converted dissolved carbon dioxide to oxygen. b. excessive rainfall over ocean waters caused carbon dioxide to separate into carbon and oxygen. c. cyanobacteria growing in ocean waters used up carbon dioxide and released oxygen. d. lightning caused the dissolved carbon dioxide in the ocean to decay into oxygen.

Hello.

The answer is: A.Ultraviolet rays from the Sun converted dissolved carbon dioxide to oxygen.

the more carbon dioxide that people pumped into the atmosphere by burning fossil fuels, the more the oceans would absorb. The ocean would continue to soak up more and more carbon dioxide until global warming heated the ocean enough to slow down ocean circulation.

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this is true, assuming that the allele is completely recessive and incomplete dominance is not a factor.