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some people have cancer tumors removed, and their cancer never returns. other people with cancer must be treated with drugs and radiation. explain why.

My best explanation is

Some cancer is in blood and tissue and doesn’t form a tumor, such as leukemia. Therefore a usage of “chemotherapy” is needed.

Sorry if this isn’t a good explanation

Depending on the type of cancer and stage it’s in, that alters many variables in treatment. An example, having a cancerous cyst being removed is more likely to remain healthy, than more complex problems like blood which is why leukemia can be fatal.

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.