What is the significance of microbial communities in coastal sediment for nutrient cycling?

• A. They drive nitrification, denitrification, sulfate reduction, methanogenesis, and decomposition of organic matter, controlling nitrogen, sulfur, and carbon fluxes.
• B. They drive only photosynthesis
• C. They do not influence nutrient cycling
• D. They only influence methane emissions.

Answer: (A)