CHAPTER 1-EARTH AS A PLAN
wer the following questions:-
1. What produces 70% of the oxygen on the Earth?
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roughly one-third (28%) of the Earth's oxygen but most (70%) of the oxygen in the atmosphere is produced by marine plants. The remaining 2 percent of Earth's oxygen comes from other sources. The ocean produces oxygen through the plants (phytoplankton, kelp, and algal plankton) that live in it.
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70% of oxygen on the Earth is produced by Marine animals.
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