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nurse12 nurse12
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6 years ago

What is a frustule?
  a. The rigid cell wall of a coccolithophore
  b. The rigid cell wall of a diatom
  c. A microscopic phage that attacks diatoms
  d. A small appendage on a dinoflagellate
  e. The photosynthetic center of cyanobacteria

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6 years ago
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