7.) Fill in the blanks: As muscles work, they use
and produce.

What are the options ???

35 cubic feet of dirt if it's digging a burrow

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