The Klinefelter syndrome is a consequence of non-disjunction mutation. It is simply understood as having an extra X chromosome for males. The Klinefelter syndrome can be a result during cell divisions either of meiotic or mitotic cell divisions. There is an imbalance of the division of cell and this resulting to Klinefelter syndrome. When a male was born, it usually has one X and one Y chromosome but in this case, a male can have one or more X chromosome. This syndrome common leads for the males having unusual physical attributes.
It helps because say the hinge joint had a structure as one of a ball-and-socket joint the knee (where the hinge joint is located) wouldn't bend it would rotate/ spin like our shoulders. This is how classifying joints according to their structure and function can/ may help describe human movement.
B.) Adding a catalyst can increase the rate of reaction
Hope this helps!
the answer is sympatry
https://en.wikipedia.org/wiki/Sympatry
you can find the whole meaning of it in wikipedia :D