The Phoenix area of the Southwestern desert typically receives 8 inches of precipitation yearly, in two seasonal patterns. Even though it is an arid region, it has high biological diversity. Thin-leaf trees abound, such as palo verde and desert ironwoods. Wide varieties of cactus thrive, including the cholla, p-r-i-c-k-l-y pear, and saguaro. Wildlife includes insects, reptiles, many bird species, small rodents, and other mammals. Which element in the Southwestern desert ecosystem is abiotic?
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