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Principle_4_9-12, The ocean plays a major role in the important geochemical cycles essential for life. Nitrogen flows to living organisms through the food chain and back to inorganic nitrogen. This is the nitrogen cycle., The atoms and molecules of earth cycle between the biosphere and the physical environment. The distribution and abundance of organisms on Earth are limited by the availability of raw materials for primary production and the supply of organic matter in different environments. Organisms play important roles in degrading organic material and recycling raw materials., There is evidence that life on Earth originated in the ocean Early life didn't use O2 for respiration. They used anaerobic respiration., There is evidence that life on Earth originated in the ocean The theory of evolution provides a scientific explanation for the fossil record of ancient life forms and the important role the ocean played in the evolution of life on Earth, Life started in the ocean There is evidence that life on Earth originated in the ocean, Most of the oxygen in the atmosphere orginally came from activities of photosynthetic organisms in the Ocean Photosynthetic organisms first evolved in the ocean. Evolution of photosynthetic organisms caused changes in earth's atmosphere which didn't originally contain CO2, Some early ocean organisms evolved the ability to use sunlight to synthesize organic molecules (photosynthesis). O2 is a waste product of photosynthesis and O2 in the atmosphere is a direct result of the evolution of photosynthesis. O2 accumulated in the atmosphere where it formed ozone and blocked much UV radiation from reaching Earth's surface, The ocean plays a major role in the important geochemical cycles essential for life. Carbon moves between the living (biosphere) and the non- living world. This is the carbon cycle., Early life didn't use O2 for respiration. They used anaerobic respiration. Photosynthetic organisms first evolved in the ocean. Evolution of photosynthetic organisms caused changes in earth's atmosphere which didn't originally contain CO2, O2 accumulated in the atmosphere where it formed ozone and blocked much UV radiation from reaching Earth's surface Today photosynthetic organisms in the ocean produce over 50% of O2 used on Earth