For plants there are cacti, creosote bush, sagebrush, and ocotillo. For animals there are the coldblooded ones such as snakes, insects, and lizards. For warm blooded ones there are kangaroo rats and kit foxes.
The temperature in the winters is generally 41°F (5°C) or below. In the summer the weather heats up to between 55° and 75°F (12 and 24°C). Most deserts get an average of 10 in. of rain yearly.
An example of a predator/prey relationship is the kit fox eats the kangaroo mouse, the kit fox is the predator and the kangaroo mouse is the prey.
The bird, phainopepla, eats the mistletoe berries and benefits by gaining energy from this food. The desert mistletoe benefits by the phainopepla when it drops its seeds to the ground, letting the mistletoe tree's seed to grow.
Animals in the desert have to compete for water because there is little water, they also have to compete for a mate.