Explain some of the factors that make it difficult for geologists to learn about the precambrian era?
can you me, really need ,

There is not much Precambrian strata preserved so it is only available to look at in certain places. 
If you are referring to life as well, very few species from pre-Cambrian. Not sure if you are asking these other questions as well but think of how the sun hits the earth based on the tilt of the earth.. and you can figure out the climate.. the areas are polar, tropical, and temperate zones. You can google planet makeup and atmospheric makeup to find that information.

Yes it is hereditary because of the penis