While species of Cyprinodon in the Death Valley region may tolerate a ~70 degree F temperature range, what two phenomenon does this depend on? Does this range vary?

I need help with a Biology question. All explanations and answers will be used to help me learn.

need two small paragraph briefly discussing two of the following questions of the instructions

 

After we have read and discussed Brown 1971, provide your thoughts here in a ~2 paragraph response.

Issues you might add in your response might include, but are not limited to:

What was the most recent common ancestor of these extant Cyprinodon species, and how have populations become isolated over time?

What is the main hypothesis the author presents? Is it supported by the results discussed?

While species of Cyprinodon in the Death Valley region may tolerate a ~70 degree F temperature range, what two phenomenon does this depend on? Does this range vary?

Why do fish in the thermal habitat prefer to stay at 108 degrees F, and how do they achieve this?

Why do these Cyprinodon populations fluctuate seasonally, and how do think they manage to persist nonetheless?