Practice question
Question
An aquatic microscopic eukaryote floats passively with plankton and possesses a wall made of two thin, overlapping silica-containing shells. Which conclusion is correct?
Explanation
The organism is a diatom. Diatoms have two overlapping silica-containing wall layers and form part of the plankton. Their accumulated, indestructible wall deposits form diatomaceous earth.
Discussion
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