What natural resources are primarily the responsibility of the US Fish and Wildlife Service?

The correct answer highlights the primary responsibility of the US Fish and Wildlife Service in managing terrestrial and freshwater fauna and flora. This agency is tasked with the stewardship of wildlife species and their habitats, which includes both land-based (terrestrial) and water-based (freshwater) ecosystems.

The US Fish and Wildlife Service focuses on conserving and protecting various species, including plants and animals, as well as their habitats in these environments. By concentrating on terrestrial and freshwater ecosystems, the agency plays a crucial role in ensuring biodiversity, facilitating recovery efforts for endangered species, and maintaining ecological balance in these ecosystems.

This option reflects the breadth of the agency's role in managing natural resources effectively, integrating both fauna (animals) and flora (plants). Understanding this distinction is essential for grasping the overall mission of the US Fish and Wildlife Service and its contributions to environmental conservation.