And also, on Q4, as well as the first answer, if the wires aren't insulated then short-circuiting will occur so doesn't this mean that the answer 'The transformer wouldn't work otherwise' would also be a valid answer??
Answer to number 2 should surely be false? Elements "up to iron" are created in a big star, then when it turns into a supernova these combine to form even heavier elements.
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