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Principle_4_3-5, Life started in the ocean There is evidence that life started in the ocean. Fossils are one piece of evidence., The ocean provides most of the oxygen for Earth through photosynthesis Photosynthesis is the process whereby some living organisms use light energy to make their own food., Ocean water is in constant motions through currents. Water movements transport nutrients and food particles to nourish living organisms., The ocean is the major source of freshwater for Earth. All water is cycled through evaporation, condensation, precipitation and transpiration in the water cycle., The ocean is the major source of freshwater for Earth. There is very little fresh water compared to the amount of ocean water on Earth, Photosynthesis is the process whereby some living organisms use light energy to make their own food. Marine plants and other photosynthetic organisms in the ocean produce over 50% of O2 on Earth., Photosynthesis is the process whereby some living organisms use light energy to make their own food. Plants and other photosynthetic organisms take in CO2 and give off O2, Ocean water is in constant motions through currents. All water is cycled through evaporation, condensation, precipitation and transpiration in the water cycle., The ocean is the source of most primary production on Earth Primary producers are the base of the food web., Ocean water is in constant motions through currents. Upwelling brings nutrients from deep water to the lighted surface zone where photo- synthetic primary producers grow.