Chapter 26 Blue Thread Question 5 Item 23 Part A Explain why cyanobacteria are so important to other types of freshwater and marine organisms that rely on oxygen, nitrogen, and organic compounds for their survival. Cyanobacteria use methane (CH4) as their carbon source, and they also use CH4 as an electron donor in cellular respiration. Therefore, they do not compete with other organisms that use oxygen and nitrogen. They also process CH4 into more complex organic compounds useful to other organisms when they decompose. Cyanobacteria are competitors to other organisms because they use oxygen for aerobic respiration, absorb various nitrogen compounds, and accumulate organic compounds. Cyanobacteria produce oxygen as a by-product of photosynthesis, produce useful nitrogen compounds by nitrogen fixation, and synthesize many organic compounds usable by other organisms when they decompose. Some species of cyanobacteria live in association with a water fern that grows in rice paddies and help fertilize the rice plants. Previous Answers Request Answer Submit P Pearson

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