The island's 47 species of honeycreeper all evolved from a single ancestor.

Its universality is to be expected if all existing organisms have a single ancestor.

Modern studies of the land plants agree that all the pteridophytes share a single common ancestor.

What is the single common ancestor from which all living matter on our planet derives?

The original perception may have been that the group was entirely descended from a single ancestor.

But each test can trace only one lineage back to a single ancestor.

In 2008, new research suggested that people with blue eyes have a single common ancestor.

In particular, no specific African musical form can be identified as the single direct ancestor of the blues.

By the convention of our society a single black ancestor makes one black.

It is well accepted that all whales evolved from a single ancestor.