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One of life's greatest [mysteries / mysterious] may finally have been [solved / soluble] . Scientists believe they have unlocked the [compendium / conundrum] of the age-old question of whether the chicken or the egg came first. This problem has [baffled / boffin] great minds for centuries. However, researchers from the University of Geneva believe they have [crackled / cracked] this philosophical mystery. They suggest the egg came first. The scientists studied a [tiny / tinny] marine organism called Chromosphaera perkinsii. This single-celled species [rates / dates] back over a billion years. The researchers found it can [form / farm] multicellular structures which are similar to animal [embryonic / embryos] . This means there was no need for a prehistoric chicken to [lie / lay] an egg.

Researcher Marine Olivetta told "Nature Journal" that Chromosphaera perkinskii was first discovered in 2017 off the [cast / coast] of Hawaii. She said it has offered many [insights / sightseers] into ancient life forms. She said: "It's [fascination / fascinating] that a species discovered so [recent / recently] allows us to go back in time [the / a] billion years." The researcher suggested that the [genetics / genesis] behind egg fertilization and embryonic development were present before animal life [existed / resisted] . This means nature could have created eggs long before [evolution / revolution] "invented chickens". A more straightforward answer to the chicken and egg problem is that chickens came [onto / into] existence 10,000 years ago, [wherewithal / whereas] eggs have existed for millions of years.