Algae
Zooxanthellae are algal symbiont that live within coral reef animals. These algae belong to

pyrrophyta
chrysophyta
chlorophyta
rhodophyta

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

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