Question

This picture shows the United States Arctic National Wildlife Refuge, a large portion of Alaska that is protected from human activities that would affect living things in the area as well as nonliving resources that support living things. Even though oil and other resources in the area could be collected and sold by humans to increase American wealth, construction is prohibited in the area.

Part of the United notes Arctic National Wildlife Refuge. Brownish-green tundra is in the foreground with mountains in the distance.

The most complex level of organizational hierarchy in the Arctic National Wildlife Refuge that is preserved is
the population of brown bears in the area.
every species of fish in the area.
every ecosystem in the area.

Answer 1

every ecosystem in the area.

Reason: an ecosystem is the highest (most complex) level listed — it includes multiple species (populations and communities) plus the abiotic (nonliving) components the refuge protects.