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15 votes
These photosynthetic protists produce one third of the Earth’s oxygen that is generated through photosynthesis.

A) algae
B) moss
C) paramecia
D) protozoans

1 Answer

5 votes

Answer:

A

Step-by-step explanation:

this is because these photosynthetic protists have chlororphyll which is capable to make their own food materials through photosynthesis

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