The natural selection process applies majorly inside back species wether than between species.
A. The connective tissues that protect the inside of the arteries and veins.
Answer:
Yes, if the touch their snot and touch you or an object you touch. They can also sneeze their existing snot at you if they didn't wipe it.
The flooding of half part of the forest have successful separate the population of frogs in that ecosystem into two different set of frogs. This is an example of allopatric speciation, that is, the population become separated as a result of geographical barrier. This separation will make the two set of frog population to become new species. On the long run, the two species may become unable to relate sexually.
The answer would be the first one :)
