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?
A) diatoms
B) brown algae
C) amoebas
D) dinoflagellates

Question

Quizplus · Accepted Answer

Diatoms are a key source of food in all aquatic environments as they are primary producers in the food chain. Their cell walls, made up of silica, are used as a filter and as a grinding and polishing agent. Brown algae also play an important role as a food source in aquatic environments, but their fossilized forms do not have the same industrial applications as diatoms. Amoebas and dinoflagellates are not significant sources of food in aquatic environments and do not have the same industrial applications as diatoms.

Which of the Following Groups Include Organisms That Are a Key