: What does it mean for a living thing to share the same ancestor? Like how do humans and lobsters have a common ancestor?

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: What does it mean for a living thing to share the same ancestor? Like how do humans and lobsters have a common ancestor?

In: Biology

Not just humans and lobsters, but human and all known life. Humans and trees, humans and grass, humans and gut bacteria.

Well, all life started as a single cell organism. From there it took different route. Some stayed at sea, some grew roots some ate other things. So yes if we trace life back to this cell we all have that common ancestor. And some can he closer related than others. Such humans and primates, or hourses and donkeys, or cats and tigers.