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In what ways do biological processes control the distributions of chemicals in the ocean? ? Photosynthesis and respiration control the distribution of many elements in seawater. Compositions of sea water ? mm filter ? Passed – ? Can not pass – ? Humic acid, protein and amino acid, polysaccharide, pigments, inanic colloids (iron hydroxide) salinity ? Total amount of salts in water Bioavailability ? Can be utilized by cells membrane ? related to dissolved materials and particulate materials ? Most particulate materials can not be efficiently utilized by phytoplankton an