As predators upon unicellular or filamentous algae, bacteria, and microfungi, protozoa play a role both as herbivores and as consumers in the decomposer link of the food chain.
(protozoa; play; a role both as herbivores and as consumers in the decomposer link of the food chain)
protozoa
play
a role both as herbivores and as consumers in the decomposer link of the food chain