What are the two genotype possible for a person who as a blood

Yes yes yes very good

The answer is viral etiology

Ibelieve this is the answer:     evolution has no "goal". it is "simply" the survival of the fittest under a given condition. what should be the advantage of living longer? getting kids (=spreading the own genetic information) is done latest until the mid-40s after that we have not much biological meaning.  in addition,  not only does evolution not have a "goal," evolution doesn't necessarily mean "make us better! " it's absolutely possible to evolve negative traits.    hpe i could : )

The uneven heating of earth due to latitudinal differences and the arrangement of oceans and continents;