Around 1800 (plus or minus about 5 years) is when it was estimated that the world's population had reached 1 billion.
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En 1953 determinó con exactitud la edad de la Tierra en 4.550 millones de años, con un margen de error de unos 70 millones de años.
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Answer:
i dont really know but i thinnk it would be III,IV and V
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