I know that previous choices can change a lot of stuff in Mass Effect 3, ranging from dead characters to different endings. My question regards specifically if you can change the behavior of former companions.
For instance, I remember in Mass Effect 2 I had a long talk with Mordin about the genophage, and I think I eventually convinced him curing it might not be a terrible idea.
Now (in ME3) he not only helps me find the cure, but he was tipping Wrex off on where to find the females.
I also remember having long chats with Jack in ME2.
Now, it seems she's no longer angry at humanity and actually wants to do some good.
My question is: have my actions influenced this (and other) behaviors? Is it possible to influence such behaviors? I remember most companions in ME2 eventually "sat down" to have some serious talk with you about themselves. Did any of that make a difference, or would the story in ME3 be exactly the same no matter what I said to my companions in previous games?