What is synovial fluid and what does it contain?

Synovial fluid is found in/in between joints to allow for a reduction in friction when movement occurs and as a shock absorber. It contains hyaluronic acid and lubricin (a type of glycoprotein)

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