You notice that water is running off the feathers of a bird in the rain. the reason is probably that the bird has coated the feathers with which keeps the water out of them.

Lipids

Explanation:

The reason is that lipids are hydrophobic.

Lipids

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.