The most complex level of organizational hierarchy in the arctic national wildlife refuge that is preserved is
a. the population of brown bears in the area.
b. every species of fish in the area.
c. every ecosystem in the area.
d. the biosphere that includes alaskan life.

Aregion is an area of land that has common features. these features can be natural, such as climate or landscape. they can also be artificial, such as language or religion. the xinjiang uyghur autonomous region, above, is an area of china inhabited by uyghurs, a muslim group with ethnic ties to turkish people.