They were good trolls until Cataclysm, or as good as NPC troll races can be. The Shattering destroyed their homeland and they'd spent the last however-many years watching the destruction of every other tribe of trolls in Azeroth. Now they've gone bad for the sake of survival.
who holds the majority population in the horde?
I assume you're asking in terms of lore, not player numbers? If that's the case, I'd guess it's the orcs. The orcs' most recent catastrophe is further back than that of the other races, and I think it's established lore that orcs breed like rabbits -- and have an accelerated rate of maturity on top of that. Or maybe that was some bad fan fiction I read once over in the weird part of the internet.
I'm really enjoying the variety of faces with wonderful expressions for my Pandaren - my Male Pandaren that is. Why are female Pandaren limited to just one face? Ideas?
My honest answer is the female pandaren have only one face because Blizzard's artists are not very good at making women's faces, especially anthropomorphic women. They seem to avoid it whenever possible and the female worgen turned out fairly horrible in Cataclysm. The pandaren could have easily been a repeat of that situation. The artists made sure they did at least one face correct and called it good.
At Sunsong Ranch sometimes the food seeds will produce a "bursting" or "plump" crop. However, I have never had a special seed (e.g. Songbell or Magebulb) do that. Am I just really unlucky or is this normal?
That's normal. The special seeds can't do either of those things.
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