A. mutations are a source of variation in the species B. mutations are the cause of disease in the species
C. mutations are not harmful when they occur in somatic cells of species
D. mutations are always passed on to subsequent generations of the species

the answer to you question is   jet streams

as the gila monster consumes the eggs or young of the desert cottontail and gambel's quail, thus its main food supply is only accessible for a restricted time duration every year. however, for this, the gila monsters exhibit three adaptations, which elevate their survival rate in the desert condition.  

first, is that they possess huge bodies, and can consume greater concentrations of food during a small period. secondly, they require to feed infrequently as they can accumulate fat in their tails. ultimately, their rate of metabolism is very low, so that they can burn their reservoirs of fat gradually.  

1. efficient use of space

2. elimination of groundwater contamination

3. energy generation

4. lower carbon footprint