Biology, 14.01.2021 23:00 cruzhazeL999
Which statement correctly describes how the amount of oxygen in the Earth's atmosphere has changed over time
a. oxygen started to accumulate in the atmosphere before photosynthesis first evolve
b. oxygen said to accumulate in the atmosphere after photosynthesis first evolved
c. oxygen started to become scarcer in the atmosphere after first episode
d. large amounts of oxygen were present in the atmosphere both before and after photosynthesis first evolved
Answers: 2
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Which statement correctly describes how the amount of oxygen in the Earth's atmosphere has changed o...
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