Why would i call 2-1-1

1- a    2 - d3 - e4 - f5 - c6 - g7 - h8 - b

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

Ican only answer your first question, a machine is like a human body because it's a little similar. they both almost work like the same.