ADJ.
largest, natural
BIOME + NOUN
earth, region
PREP.
on
noun
Any major regional biological community such as that of forest or desert.
All the genomes of such a community.
Alpine tundra is a biome or natural region at high elevation which does not contain trees.
The taiga ecosystem is the largest biome on Earth and is home to many species of coniferous trees.
The steppe ecosystem is a grassland biome that is found in temperate regions around the world.