Algae
Chlamydomonas and Volvox are similar because

they are members of the Chlorophyta
they both are motile
none of these
Both (a) and (b)

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

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

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