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This doesn't balance the sex scales exactly, but it does come close: Among the total human population, the ratio of men to women is The disadvantage runs to adulthood, too, as adult men kill each other more often, take more risks and have more health problems, on average, than women, all of which cause them to die younger. Gradually the population will approach a gender balance. If this were the case, then newborn males would naturally have better mating prospects than newborn females, and could expect to have more offspring. The widely-accepted answer to this question was first put forth by Sir Ronald Fisher, a renowned evolutionary biologist who worked in the first half of the 20th century. Men produce an ungodly amount of sperm , while women have a finite egg count. As far as evolution is concerned, why couldn't humanity make do with fewer men and more women?

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