You discover a single-celled organism living in a tide pool encased within a glassy wall-like shell.It has a centric shape.You have discovered a

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The glassy wall-like shell is a characteristic feature of diatoms, which are single-celled algae with a unique cell wall made of silica. The centric shape also suggests a diatom, as they can be either centric (circular) or pennate (elongated). The other options do not have a glassy shell-like structure, and their shapes are not centered.

You Discover a Single-Celled Organism Living in a Tide Pool