However, to be appointed to the Senate, one must be at least 30 years of age, must possess land worth at least $4,000 in the province for which he or she is appointed, and must own real and personal property worth at least $4,000, above his or her debts and liabilities.
A dense Joshua tree forest also exists in Mojave National Preserve, in the Cima Dome, (Cima, California), northeast of Kingman, Arizona in Mohave County, Arizona, as well as along U.S. 93 between the towns of Wickenburg and Wikieup, and designated as the Joshua Tree Parkway of Arizona.
First, the match between the Joshua tree flowers and the moths' ovipositors suggested that coevolution might have molded the relationship between the plant and the pollinator. Second, because the plants are completely dependent on the moths for reproduction, the differences in the flowers might have caused Joshua trees to split into two different species. This might provide an explanation for how interactions between species have generated the diversity of plants and insects.