Around 4.2 billion years ago, life on Earth already existed. A universal common ancestor, named LUCA, was there. How did this ...

They all have this common ancestor,” said Edmund Moody, lead author of the new study. “We have this idea that this was a fairly complex organism, already possibly by the time of like 4.2 ...

That ancestor is called LUCA, the last universal common ancestor, and there is no fossil record to tell us what it looked like. Luckily, we have Jonathan Lambert.

The last common ancestor of all modern mammals likely looked like this recreation of a fossil animal, Morganucodon, which lived about 200 million years ago. Funkmonk/Wikimedia Commons ...