The biggest threats to christmas island crabs during their annual migration are a. dogs c. automobiles b. cats d. fences

answer; i believe the correct answer is (sporophyte);

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.