what does the national park service manage?\nmemorials\nwildlife refuges\necosystems\nendangered species

Brief Explanations:

The National Park Service is responsible for managing a variety of natural and cultural - related areas. While it may have some involvement with wildlife refuges, endangered species, and memorials in certain contexts, its over - arching role is to manage ecosystems within national parks, which include a wide range of natural and cultural resources.

Answer:

ecosystems