Does the amount of light affect the activity of a bettle i need a indepedent and dependent variable and a hypothesis

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.

i think the answer is a.keratin is the pigment responsible for skin color.

actually the answer is c