Histamin what is their purpose in the immune system

  well it increases the permeability of the capillaries to white blood cells and some proteins, to allow them to engage pathogens in the infected tissues... i hope this is what you were looking for 

I’m going to guess these are the choices: a) recreational skiing developed in the mid-19th century b) it was originally invented as a way of getting from place to place in snowy regions c) downhill skiing is currently the only common form of the sport d) it mostly evolved from snowshoeing- if that’s the cases then the answer would be c) downhill skiing is currently the only common form of the sport