There is no 'world desert'. There are about 28 major deserts located across the globe. There is no single entity of a worldwide desert biome.
There is a desert biome in central Australia.
the Sahara desert
desert
In the United States it is the Mojave Desert that is located within the desert biome. It is a Native American culture that you will find in this region.
Desert is the biome for a desert.
Bacteria and fungi are the main decomposers in the desert and most any biome.
The desert is a biome.
Desert
the desert......
Northern Africa - the SaharaSouth-central Africa - the Kalahari Desert Southwestern Africa - the Namib Desert
There is no such place as a 'savannah desert.' Savannahs are grasslands and receive more rain than a desert. They are a distinct biome from a desert.
There is no such thing as the Savanna Desert. The savanna is a semi-arid transitional biome between a desert and another biome such as a grassland. The largest is in Africa below the Sahara Desert.