Beginner Gardening: Help with plant identification (a few), 1 by sbeacher

sbeacher wrote:
I also have this flower or whatever that was doing great but then all of a sudden all the leaves just about turned yellow and died off (it was a lot bushier before) I was thinking maybe because it was in the only room in my house that has an A/C unit so it was getting messed with there (also no direct sunlight in that room) so I moved it to the window to see what happens. Any idea what kind of flower this is and the best way to take care of it?