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One of life's
mysteries may have been solved. Scientists believe they have answered the
-old question of whether the chicken or the egg came
. This problem has baffled us for
. However, researchers in Switzerland believe they have cracked this
. They suggest the egg came first. The scientists studied a
marine
. The single-celled species dates back over a
years. The researchers found it can form multi-cellular
that are similar to animal embryos. A
chicken did not need to lay an egg.
