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Evolution can be studied on the molecular level by comparing DNA, proteins, and cell functions. All living things share some cellular processes, such as glycolysis. These shared processes are thought to have arisen in an early life form and have been inherited by the descendents.

The gene for a protein involved in a basic cell function would be expected to be

A

absent in most modern eukaryotes.

B

present in a large range of species.

C

exactly the same in all modern organisms.

D

found in animals and fungi, but not plants.

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