Major ecosystems determined largely by climatic regions and classified largely based on predominant vegetation are called:. a. associations.
b. zoogeographic regions.
c. biomes.
d. climate zones.

the climate and geography of a region determines what type of biome can exist in that region. Each biome is made up of many individual ecosystems. Communities within the biome have adapted to the small differences in climate and the environment inside the biome.

Explanation:

tge answer is a. the world in spatial terms