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B
Chlorella
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C
Hirudinaria
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D
Chlamydomonas
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Solution
The correct option is ACeratium The transverse flagellum beats in a spiral motion, while the longitudinal flagellum pulses in waves. Most Ceratium species also contain chloroplasts. Certain species are bioluminescent. Under adverse conditions, Ceratium are able to encyst themselves as a form of protection.