Which of the following groups include organisms that are a key source of food in all aquatic environments and whose fossilized forms are used as a filter and as a grinding and polishing agent?

Question

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Diatoms are a key source of food in aquatic environments and their fossilized forms, also known as diatomaceous earth, are used as a filter and as a grinding and polishing agent. Dinoflagellates are also important primary producers in aquatic environments but their fossilized forms are not used in industry. Amoebas are mostly free-living and not significant sources of food in aquatic environments. Brown algae are macroscopic and mostly found in coastal regions, but their fossilized forms are not used in industry either.

Which of the Following Groups Include Organisms That Are a Key