It isn't. Cacti can be grown in many climates, but most simply prefer the arid desert climes. They don't exist in other climates because other plants that are more suited to those climates choke them out by growing faster and blocking sunlight.
Clarification:
There are cactus species that grow in tropical rain forests, grasslands and other biomes. They are not restricted to deserts alone.
a cactus lives in a desert
The Simpson desert contains many types of vegetation including the Barrel Cactus, Organ Pipe Cactus. Saguaro Cactus, Prickly Pear Cactus.
a cactus lives in a desert
in the desert
The fishhook barrel cactus is found in both the Chihuahuan Desert and the Sonoran Desert.
The Answer Is Cactus! CTUSAC = CACTUS :)
I can find no cactus named the "pippithrop cactus."
The name of a large cactus commonly found in desert regions is the saguaro cactus.
it is because cactus can survive in the desert so it is found in Atacama Desert.
There are no pronouns in the sentence, 'A cactus blooms in the desert.' A = article cactus = noun blooms = verb in = preposition the = article desert = noun
The organ pipe cactus is primarily found in the Sonoran Desert.
As far as the total bulk of cacti, that desert would probably be the Sonoran Desert. That desert has the largest cactus species in the world.