Question

18 multiple choice
an area distinguished by one or more unique characteristics is a
biome
toponym
region
landscape
uniform unit

Explanation:

A region is an area that can be distinguished by one or more unique characteristics such as physical, cultural, or economic features. A biome is a large - scale ecosystem, a toponym is a place - name, a landscape is more about the visible features of an area, and a uniform unit is a more general and less relevant term here.

Answer:

C. region