The usefulness of epidemiological studies are limited because

Question

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All of the choices listed contribute to the limitations of epidemiological studies. The sample size may be too small to detect statistically significant differences, people are exposed to multiple chemicals throughout their lives which makes it difficult to attribute a specific health effect to a specific chemical, we cannot use epidemiological studies to study future hazards, and epidemiological studies often take a long time to complete. Therefore, the limitations of epidemiological studies mean that they should be used in combination with other types of studies, such as toxicological studies and laboratory research, to gain a more complete understanding of the potential health effects of exposure to toxic chemicals.

The Usefulness of Epidemiological Studies Are Limited Because