Algae
Chlamydomonas and Volvox are similar because

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

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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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