How has the u. s. fish and wildlife service positively impacted ecosystems?
a. by regulating private land use
b. by conserving wildlife habitats
c. by banning hunting and fishing
d. all of the above

The U.S. Fish and Wildlife Service have positively impacted ecosytstems by b.) conserving wildlife habitats.

b. by conserving wildlife habitats

US fish and wildlife services positively impacted ecosystems by protecting the endangered fish species. The programs initiated by these services has a typical goal for conserving, protecting and enhancing fish, wildlife and plants for securing natural wildlife habitats. It performs responsibilities like enforcement of federal wildlife laws, protection of endangered species, management of migratory birds, restoration of nationally significant fisheries, conservation of wildlife habitat.

the element that provides strength to the exoskeletons of clams and oysters is phosphorus.

this is so because calcium carbonate is the main component in the shells. calcium carbonate is strengthened by phosphorus.

explanation:

there really is life in the deepest part