Which group of organisms consists entirely of diatoms?
Correct answer C. Pinnularia, Navicula, Cymbella, Melosira
Explanation
Pinnularia, Navicula, Cymbella and Melosira are all diatoms, single-celled algae with silica walls, whereas the other groups contain euglenoids, cyanobacteria or dinoflagellates.
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