How did the thinking process ever originate?

@ananth85 (209)
India
January 27, 2007 12:08pm CST
We all are able to think, because we have an ancestral history, where every type of human has been able to think.. It`s ofcourse like a chain. So, who`s our foremost ancestor? Monkeys or Apes or Orangutans or Gorillas or any other creature? Any idea?
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