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Question
Which of the following best describes the algae known as diatoms?
Options:
A .  Cells contain carotenoid pigments as well as chlorophyll A and B
B .  Cells are encased in rigid walls composed of cellulose coated with silicon
C .  Cells have intricate shells of silicon dioxide with two halves
D .  Cells have flagella and a light-detecting eye spot
Answer: Option C

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