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Which role of protists has the most positive effect on maintaining the plant population in an ecosystem?
A. Protists are a major food source for animals.
B. Protists produce approximately 75 percent of the oxygen on Earth.
C. Protists decompose dead materials, returning nutrients to the soil.
D. Protists found in the gut of animals assist in digestion.
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Which role of protists has the most positive effect on maintaining the plant population in an ecosys...
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