What will likely happen to a species that cannot adapt to changing environmental conditions?

They will become extinct over time. This is because they will be unable to survive in the changed environment due to lack of desirable traits. This is especially true for a small population of species that do not have a wide variation in their genotypes on which natural selection could act upon.  

they absorb it i think

not sure

you

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.