Why is mesquite tree less dependent on rainfall than a cactus?

Mesquite trees are less dependent on rainfall than cacti because they have deep root systems that can access groundwater, allowing them to thrive in arid conditions. Additionally, mesquite trees are deciduous, shedding their leaves during dry periods to conserve water, while cacti rely primarily on surface moisture and have a more limited ability to tap into deeper water sources. This adaptability enables mesquite to survive in environments with sporadic rainfall better than many cacti.