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A MAYNOOTH scientist has made a major breakthrough in understanding how complex life on Earth originated.

It is known from fossil records that life on Earth began about three billion years ago, but for the first billion years only single-celled organisms existed.

The process by which those organisms became multi-celled organisms such as plants and animals, including humans, is one of the great questions of science, along with the origins of life itself.

All multi-celled organisms and some unicellular organisms are distinguished by having a nucleus that contains their genetic material for reproduction.

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