Question

which of the following types of sites does the national park service manage?
memorials
wildlife refuges
ecosystems
endangered species

Explanation:

The National Park Service manages various sites, including memorials. Memorials are among the types of sites under its purview. Wildlife refuges are mainly managed by the U.S. Fish and Wildlife Service. While the National Park Service protects ecosystems and endangered species within its parks, the question asks about the type of site (memorials is a specific site type).

Answer:

memorials