Which statement is an example of a scientific theory? a. the amount that caffeine affects a person's heart rate differs based on the person's age. b. the earth is the third planet from the sun and has one moon, which orbits the earth. c. hummingbirds do not like the color white because they visit other colored flowers more often. d. all living organisms are composed of one or more cells, which came from pre-existing cells.

Pretty sure it's A because people can redo this test as many times as needed to verify the answer.

D. All living organisms are composed of one or more cells, which came from pre-existing cells.

Explanation:

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the generally accepted parts of modern cell theory include: all known living things are made up of one or more cells. all living cells arise from pre-existing cells by division. the cell is the fundamental unit of structure and function in all living organisms.

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