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Principle 4 3-5 July 19 2007, The ocean makes Earth habitable. II - The ocean provides most of the oxygen for Earth through photosynthesis, The ocean makes Earth habitable. The ocean is the major source of freshwater for Earth. See Principles 6 and 3, I - Life started in the ocean A - There is evidence that life started in the ocean. Fossils are one piece of evidence., II - The ocean provides most of the oxygen for Earth through photosynthesis B - Photosynthesis is the process whereby some living organisms use light energy to make their own food., B - Photosynthesis is the process whereby some living organisms use light energy to make their own food. 2 - Marine plants and other photosynthetic organisms in the ocean produce over 50% of O2 on Earth., B - Photosynthesis is the process whereby some living organisms use light energy to make their own food. 1 - Plants and other photosynthetic organisms take in CO2 and give off O2, The ocean makes Earth habitable. I - Life started in the ocean, The ocean makes Earth habitable. The ocean moderates Earth's climate. See Principles 6