The release of histamines does not cause infection in the affected area. It is the bacterias which are the ones responsible for infections, for illnesses such as strep throat, urinary tract infections and tuberculosis.
Analogies are the result of convergent evolution. Interestingly, though bird and bat wings are analogous as wings, as forelimbs they are homologous. Birds and bats did not inherit wings from a common ancestor with wings, but they did inherit forelimbs from a common ancestor with forelimbs.
The biome that has over 100 inches of rain each year is the Rainforest. Therefore, the Rainforest has abundant rainfall.