Practice question
Question
An aquatic microscopic organism is photosynthetic, floats passively with plankton and possesses indestructible silica-containing walls. Which ecological conclusion follows?
Explanation
The organism is a diatom, a photosynthetic chrysophyte that forms part of the plankton. Diatoms are described as the chief producers in oceans, and their accumulated silica-rich walls form diatomaceous earth.
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