A fox is carrying a dead squirrel as a hawk swoops down to grab it. They both pull on the squirrel but the flapping wings of the hawk against the face of the fox are strong enough to make the fox drop the squirrel.

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explanation:

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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.