Photosynthetic autotrophs changed the composition of the atmosphere during the oxygen revolution. Indicate whether the statement is true or false
ANS: T
The amount of free oxygen in the atmosphere went from 1% to 20% during the oxygen revolution.
This abundance of oxygen made aerobic respiration practical. This led to the rise of animals.
Information can be found in the section Animals Evolved When Food and Oygen Became Plentiful.
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Which pair of bases is linked together by three hydrogen bonds?
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