What happens when atoms do covalent bonding?

Atoms will covalently bond with other atoms in order to gain more stability, which is gained by forming a full electron shell. Hope this helps.

we would need to see the picture to answer it

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.