Cells are extremely small things that are in our bodies, animals, plants, and bacteria. Each type of cell (the previous list) is different, but each have a basic structure. There is more than just that, though, there are also two, larger group varities in cells, Prokaryotic and Eukaryotic cells. Most cells in the present are Eukaryotic, but bacteria are Prokaryotic. Animal and Plant cells both have cell membranes, ribosomes, a nucleus, endoplasmic reticulum, and DNA.

Prokaryotic cells also have DNA and ribosomes, but do not have a nucleus or a cell membrane. Prokaryotic cells are less advanced than Eukaryotic cells in evolution.
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