If he died in Mass Effect 1 then he is not in Mass Effect 2. If he survived Mass Effect 1 he shows up in Mass Effect 2 but he can not be killed.
If you played Mass Effect 1 the second game imports your old game save, so it would depend on how you played Mass Effect 1 as to whether or not Kaiden is alive. If you did not play Mass Effect 1, then the game will default to the character with the opposite gender to Shepard. So Ashley will be there with a male Shepard, Kaiden for a female one. Below is a link which has the important decisions you make in 1 and their effect in the sequel.
If you import save data from Mass Effect 1, then whichever character lived through the first game will be in ME2. If you don't import save data and don't use Genesis, Kaiden will be in the game, but Ashley won't.
Mass Effect 2 is a 15.
No, Mass Effect 2 has a completely different weapon system.
mass effect 2 will be
The SSV Normandy in Mass Effect The Normandy SR-2 in Mass Effect 2 & 3
Mass Effect 2 is rated M for mature by the ESRB.
Mass Effect 2 is rated M for mature by the ESRB.
No mass effect 2 will only be on xbox 360 and PC
If you don't import a save game from Mass Effect, you will automatically choose the character of the opposite gender to survive. If you play Mass Effect first, though, you can choose if you want Ashley or Kaidan to survive. So to play Mass Effect 2 as a female and with Ashley alive, you would have to play Mass Effect and let Kaidan die on Virmire.
BioWare, the developer of Mass Effect has confermed Mass Effect 2 to come out in 2010.
Archangel from Mass Effect is Garrus Vakarian