Biology

The correct answer is: D.Cell membrane

Explanation:

A.Nucleus: This is not common to both prokaryotic and eukaryotic cells. Eukaryotic cells have a nucleus that contains their DNA, while prokaryotic cells do not have a nucleus. In prokaryotes, the DNA is located in a region called the nucleoid, but it is not enclosed by a membrane.

B.Mitochondria: These are not found in prokaryotic cells. Mitochondria are membrane-bound organelles found in eukaryotic cells and are involved in energy production (ATP). Prokaryotic cells perform energy conversion in their cell membrane but lack mitochondria.

C.Chlo...