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Discover LudwigThe phrase "common ancestor" is correct and can be used in written English.
You can use it to refer to a single ancestor that two or more individuals or groups of people have in common. For example, "Genetic analysis suggested that George and Cynthia had a common ancestor from Eastern Europe."
Dictionary
common ancestor
noun
An ancestor that two or more descendants have in common
Exact(60)
What is a "common ancestor"?
Inherited from a common ancestor.
"But we do share a common ancestor".
"We can see beyond the last common ancestor".
Humans, chimpanzees, and bonobos share a common ancestor.
The Vikings were the common ancestor of the Nordic peoples.
He said the two share a common ancestor.
Identical changes in different men point to a common ancestor.
Both evolved from a common ancestor in the Late Triassic.
Now remember, homologous means inherited from a common ancestor.
One occurred in the common ancestor of extant seed plants and the other in the common ancestor of the angiosperms.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com