An example of a time span (1 ene 1987 año – 1 ene 1987 año)

Descripción:

population geneticists first demonstrated the existence of such a 'mitochondrial Eve'. After analysing DNA from 147 people from around the world to chart their genetic relationships, they used a 'molecular clock', based on the number of DNA mutations that arise with each generation, to estimate Eve's age

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