is it behavior or behaviour?

i get confused when a teacher writes behavior and the doctor writes bahaviour..which is it

Answer #1

It’s both. “Behavior” is the American spelling and “Behaviour” is the British spelling.

Answer #2

Oo no wonder ppl use both

Answer #3

the first one :P and with mom, its mom, and mum… but i really cant stand the word mum for some reason

Answer #4

just like, ur color and our colour:D and centre

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