What features of a cactus give it advantages in an arid climate?

Cacti have adapted well to life in arid climates. They have everything to extract and store water. First, their roots go deep into the ground. There is more moisture. Secondly, cacti have a fleshy stem. There are water supplies here. And the thick skin is sun protection. Thirdly, cacti do not have ordinary leaves, but only thorns. Therefore, the evaporation of water is minimal. Fourthly, the trunk of a cactus has many branches. This creates shade and lowers the temperature. Fifth, many hairs throughout the stem also reduce moisture evaporation.