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Popular Mechanics

LUCA, the Last Universal Common Ancestor, must’ve been on Earth 400 million years after its creation, scientists say

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LUCA is the Last Universal Common Ancestor, or LUCA , the oldest common ancestor of all living things.

A new study from an international team of scientists estimates LUCA arrived on Earth 4.2 billion years ago .

LUCA was a simple prokaryote-like organism, but it likely had an immune system, scientists say.