Use the drop-down menus to complete the statements. investigations allow for the control of variables and can be repeated.

investigations are usually less time-consuming and less expensive.

investigations make it possible to study a wide range of variable

It hurts for them at first then they get used to it

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