Examlex
Which of the following kinds of studies would be the best to use when investigating whether cigarette smoking influences weight gain?
DNA
Deoxyribonucleic acid, a molecule that carries genetic instructions used in growth, development, functioning, and reproduction of all known living organisms and many viruses.
Geneticists
Scientists who study genes, genetic variation, and heredity in living organisms.
Identical Twin
A twin resulting from the fertilization of a single egg that then splits, sharing exactly the same genetic material.
Alcohol Dependence
A medical condition characterized by an addictive need for and use of alcohol, despite adverse effects on health.
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