Which of the following is NOT an example of a model used in science and medicine? Non-human animals (e.g. rats, dogs, monkeys) being used to research diseases that affect humans

1. The equipment found in a medical lab
2. The mathematical equations that explain how quickly oxygen diffuses into the blood
3. Illustrations showing the most common locations and shapes of organs in the body
4. The germ theory of disease which states that microorganisms (e.g. bacteria and protists) can act as pathogens or "germs" and cause an infectious disease

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