Animals that are segmented and have jointed appendages and an exoskeleton are members of the phylum

digestion

it excretes wastes

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.

for a different answer set the answer would be because the oxygen in the water had depleted (apex)