Scientists apply the concept of a molecular clock to estimate the time two species evolved separately.

Which data are most useful for the estimation?

A. common traits of the two species
B. homologies among the two species
C. DNA sequence differences between the two species
D. DNA fingerprinting of common fossils

answer; ///i do believe the answer is (virus);

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.