Describe the general structure of DNA.

Helix

Explanation:

✿   this landform has a high elevation and a high relief

✿   this landform is a mountain

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.