A student is examining a cell using a microscope. She is able to identify the cell membrane, cytoplasm, a small vacuole, and the nucleus, but she does not see a cell wall or any chloroplasts. She concludes that the cell is a eukaryotic cell.

Which of the following is evidence that her conclusion is correct?
 

Explanation

According to the passage, the presence of a cell nucleus defines a cell as eukaryotic.

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