––––– are among the most numerous of all unicellular organisms in the oceans and produce a major portion of the earth's oxygen supply.
A
Red algae
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B
Sporozoans
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C
dinoflagellates
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D
Diatoms
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Solution
The correct option is D Diatoms Diatoms are among the most numerous of all unicellular oganisms in the oceans and produce a major portion of the earth's oxygen supply.