Which came first, the chicken or the egg? Scientists think they've finally cracked the age-old debate

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Which came first, the chicken or the egg? Scientists think they've finally cracked the age-old debate

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It's the age-old riddle that has baffled scientists for hundreds of years. But experts may have finally cracked the conundrum of whether the chicken or egg came first. Scientists from Geneva University say the building blocks of female reproductive cells – eggs – appeared long before chickens evolved. They analysed a single-celled species called Chromosphaera perkinskii that was discovered in 2017 in Hawaiian marine sediments. The first signs of its presence on Earth have been dated at over a billion years ago – well before the appearance of the first animals.
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