Determine whether the description corresponds to an observational study or an experiment. research is conducted to determine if there is a relation between lung capacity and proximity to coal mines. nothing nothing does the description correspond to an observational study or an experiment?

The description corresponds to an observational study.

Explanation:

In Observational studies, researchers observe the effect of a risk factor without changing what is exposed to it or its conditions. On the other hand, in an experimental study, researchers can introduce a change and study the effects of it.

this doesn't support enough information to answer the question.

i would say b. research typically uses a variety of sources