A study where you try to observe subjects in a natural environment is a(n): A. hypothetical study.
B. performance study.
C. observational study.
D. experiment.

idk

explanation:

the wetland preservation movement began in the u.s. in earnest with the clean water act (cwa) of 1972. although not specifically written to protect wetlands, the cwa is comprised of a series of regulations designed to prevent pollutants from contaminating u.s. waters.