You can buy a Mass Effect 2 Key for PC on Steam, Origin, or G2A.com.
You have to buy it.
You can buy them from Citadel Souvenirs.
Omega has multiple armor upgrades.
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.
You can look for pets at shops on Illium and the Citadel.
Mass Effect 2 is a 15.
Fallout new Vegas
No, Mass Effect 2 has a completely different weapon system.
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Mass Effect 2 is rated M for mature by the ESRB.
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.