Arealsearcher was performing a test to check the effect of induced point mutation. but the experimental nous could not survive. what might be the reason

The reason  for this is most likely a lethal mutation. This is a mutation where the  effects can result in the death of an organism carrying the mutation.  It's also known as a lethal factor or lethal gene.

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.