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2. Microorganisms can be beneficial to the overall health of an ecosystem.
Which of the following ways are microorganisms helpful to ecosystems?
A. Microorganisms using oxygen for aerobic cellular processes.
B. Nitrogen-fixing bacteria provide a usable form of nitrogen for other organisms.
C. A green algae bloom blocks sunlight from an aquatic ecosystem.
D. A virus releases toxins into the soil, destroying decomposing microorganism’s



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