Algae
Characteristics used to place algae into divisions include all of the following except

flagella number and location
accessor pigments used in photosynthesis
form of storage material
All of these

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Algae
Which of the following best describes the algae known as diatoms?

Cells have intricate shells of silicon dioxide with two halves
Cells are encased in rigid walls composed of cellulose coated with silicon
Cells contain carotenoid pigments as well as chlorophyll A and B
Cells have flagella and a light-detecting eye spot

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