Human eye color is an example of a trait that varies

Eye color is an example of polygenic inheritance. This trait is thought to be influenced by up to 16 different genes. Eye color inheritance is complicated. It is determined by the amount of the brown color pigment melanin that a person has in the front part of the iris.

Explanation:

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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.