yeah we know that much about the designers but what people mean is whats the biological explanation of the change? if there is no visable evidence of the biological change then people will feel cheated, its like human characters in a movie, you have to give them substance and backgrounds on their history and other facts like that, it makes the audience identify with them, thats what they seek from asking this question about the change in the aliens, we all know that there were different designers but people want to know in terms of the actual movie world, why the changes occur.
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