Algae
Which algal division is divided up into three main groups consisting of the golden-brown algae, the yellow-green algae and the diatoms?

Chlorophyta
Chrysophyta
Phaeophyta
Pyrrophyta

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

Cells have flagella and a light-detecting eye spot
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

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