The world would be almost exactly the same because we are humam and always find problems because there is really no such thing as a perfect society.. Read, "The Giver" i cant remember the author but its sort of an old book. It has a lot on a perfect society were everyone was kind of like 1 race and brain washed! Lol its a good book i had to read in 7th grade!!
No, a server transfer does not include a race change. You will have to pay an additional fee if you want to race change too.
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Yes, they learned to do all the important things; like have children - without which, we (as a race) would not have lasted too long.
You have to create another character and choose to be a worgen or change your race to worgen if your class is compatible with that race.
No, you cannot change your race. Why would you want to? You're perfect whether you're black, white, Asian, or a mix of different races. You are you for a reason.
Class changes are not possible in World of Warcraft at this time. If you want to change your race, you can only choose from races which have your current class available. For instance, if you are a Night Elf Druid, you can only change into a Worgen, Tauren or Troll - these are races that have the Druid class available.
No, it is impossible to change a baby's race. Race is genetic. Even if you got surgery to make you look Chinese when you are really African you would still be African. You'd just look Chinese.
You get to pick another race, from the available options, and customize it.
They, along with the rest of the human race, would not exist.
Not the world, but it might end the human race.
If you mean the race of person you are, no.
Unfortunately, once the player has chosen and confirmed their race, name, etc. it can't be changed on any console except for the PC.