Sahara desert
The lack of it.
The desert biome makes up a large portion of the southwest United States.
What biomes makes up most of Northern Africa
It connects Africa and Asia, with trade routes to Europe as well.
Temperate Grassland
because of its tall leaves
Much of the central part of the United States is grassland.
Temperate grassland
The freshwater biome covers only 0.8% of the total water on this Earth, yet the water which makes up this biome are distributed unevenly throughout the globe. As a result the climate of these Biomes is greatly diverse depending on the region.
The Taiga (a.k.a boreal or coniferous forest)
The taiga biome has such a spongy surface from the weather slowing down decompisition which makes the vegetation on the ground have a spongy surface.