8. All forms of energy can be transformed into what form of energy? a- Electric energy
b- Radiant energy
c- Sound energy
d- Thermal energy

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.

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.