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Answer: It would be rather difficult for the small number of vampires that exist to kill six billion humans. Even if they could, they would be eliminating their food supply. As to the Volturi, it's unlikely all three would die and at the same time. It's probable that a line of succession is in place to replace them. There are other vampires working within the Volturi organization that we don't happen to see.

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Answer: The werewolves in the Twilight series are Quiliute Native Americans who mostly live on their reservation, have their own school, own legal system, etc. Being as it's a rather cloistered society, it would be easy for certain members to generally go unnoticed.

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Answer: Renesmee is not immortal, but will live an extraordinary long life and she will age slowly. It was never revealed if half-breeds can succumb to human ailments. Considering half-breeds are extremely rare, it's unlikely anyone knows.

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Answer: If, in the future, Renesmee left, Jacob would have to accept that, regardless of whether or not he was emotionally hurt by it. Because he imprinted on her, he is bound to abide by her needs and decisions.

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Answer: That is the grown-up Renesmee who Alice sees, but the vision is rather vague. As has been pointed out by the Cullens, Alice's visions are subjective. If the people she sees in them change direction or make different decisions, then the visions become different. It is implied that Jacob and Renesmee will become a romantic couple after she matures. Even if they don't, because Jacob has imprinted on her, he will always be her protector.

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Chosen answer: It's because it's a computer generated image. Renesmee, Edward and Bella's daughter, grows almost three times as fast as a normal human child would, maturing in about seven years. To achieve the effect, a young actress was used for the motion capture and the as the framework for what Renesmee would look like at various stages of her development. CGI effects have come a long way, but it's still imperfect and can look unnatural.

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