Biology

The correct answer is D.Cells.

Both eukaryotes and prokaryotes are composed of cells. In fact, the term "cell" refers to the basic unit of life, and all living organisms are made up of cells. Here’s a breakdown of the structures you mentioned:

A.Nucleus: Only eukaryotic cells have a true nucleus. Prokaryotic cells do not have a membrane-bound nucleus; instead, their genetic material is located in the nucleoid region.

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