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Assessment
What is the primary role of phytoplankton in aquatic ecosystems?
They produce oxygen through photosynthesis.
They consume organic waste.
They regulate water temperature.
They act as primary consumers.
Which nutrient is most commonly a limiting factor for phytoplankton growth in ocean waters?
Calcium
Iron
Nitrogen
Phosphorus
During which process do phytoplankton contribute most directly to the carbon cycle?
Respiration
Photosynthesis
Decomposition
Sedimentation
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