If you spare Morinth and let Samara be killed, Morinth will join you and will be loyal.
She is a part of Samara's loyalty quest. At the end of the quest, Samara and Morinth will start to fight and enter a stalemate. To add Morinth to your party, you have to choose to side with Morinth in the fight. This choice will kill Samara though.
Thane, Garrus, Jacob, Miranda, Tali, Legion, Grunt, Jack, Mordin, Samara/Morinth. Those are the normal ones. If you get the downloadable ones you can also add Zaeed and Kasumi.
Yes, you can choose. The game will ask you when you start new game, but it tends to be better if you make good choices in the first one.
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.
buy all of the upgrades for the ship and it helps if everybody is loyal.
The squad members are: Miranda Lawson, Jacob Taylor, Grunt, Jack, Garrus Valkarian, Samara or her daughter Morinth, Mordin Solus, Liara T'soni, Tali'Zorah nar Rayya and Thane Krios. DLC adds Zaeed Massani and Kasumi Goto.
No because you choose who you want to recruit first to the normandy.
You can scan planets and build relationships with the characters. You can also import the save game into Mass Effect 3, or import it into Mass Effect 2 so you start at the same level as when you finished the game. Other bonuses are included if you choose that option.
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.
The effect of mass extinction is extinction, death of a mass
Yes, there will be a Mass effect 3. even if your Shepard died, there will be a mass effect 3.
mass effect 2 will be