The first line of defense involves which structure(s)? 0 T-cells O skin O blood O B-cells​

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

The administration should take action.

Dairy, grains, protein, fruits, vegetables