A limnologist is studying a stratified lake in the summer. She observes that oxygen levels in the deeper water are nearly absent, while the surface remains oxygen-rich. However, microbial activity is still present at deeper depths. Which microbial process is MOST LIKELY dominant in the anoxic layers of the lake?

Question

Answer

Aerobic respiration using dissolved oxygen

Answer

Oxygenic photosynthesis by phytoplankton

Answer

Chemoautotrophic oxidation of iron using sunlight

Answer

Sulfate and nitrate reduction by anaerobic microbes

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A limnologist is studying a stratified lake in the summer. She observes that oxy...

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