Biology

The correct answer is: B.Eukaryotic cells have a defined nucleus and membrane-bound organelles.

Explanation:

Eukaryotic cells are distinguished from prokaryotic cells by the presence of a defined nucleus that contains the cell's DNA, as well as membrane-bound organelles (such as the mitochondria, endoplasmic reticulum, and Golgi apparatus). These features are absent in prokaryotic cells, which lack a true nucleus and membrane-bound organelles.

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