SOME THING THAT CAN BE PASSED ON SUCH AS AN ILLNESS, LIKE THE FLU.In terms of human geo. it is the distance-controlled spreading of an idea, innovation, or some other item through a local population...
I have dermatigraphic urticaria and a minor hydro urticaria and when my symptoms showed up at the age of 3 my dermatologist said i was born with it, so it is probably hereditary even if ur parents...