So 802.11g is compatible with 802.11b, but not the other way round.
Taurus is compatible with Capricorn.
b, the network will ALWAYS drop to the slowest device no matter if there are faster devices on it. n devices would slow down to g or b speeds also. The slower one can't go faster so the faster ones have no choice but to slow down. You can get around that problem if you were to get a Dual Band router and put the slower devices on a different band and then there wouldn't be a problem.
yes
Dodge Ram 2500 car parts are compataible with dodge ram 2500. this way you know they are compatible and don't have to worry if something will not work