Evolution as fact refers to the historical reality that species are related through common ancestry.

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With no environmental clues as to their common ancestry, the birds were nevertheless able to engage in full-fledged nepotism.

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This is one of the most solid pieces of evidence confirming our common ancestry and the truth of evolution.

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Yet two-fifths of Americans still refuse to accept that human beings share a common ancestry with animals, preferring to believe that they were created in their present form in the past 10, 000 years.

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Mr. Vice President, on the surface, we don't share a common ancestry, but on a deeper level we do share a common story, an American story, of achieving our dreams thanks to the sacrifice of our immigrant forebears.

WHITEHOUSE: President Obama and Vice President Biden Speak at an Inaugural Luncheon | The White House

Cystic fibrosis is most common in white people of Northern European ancestry, but also occurs in Hispanics, African-Americans and some Native Americans.

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Padilla, an American citizen of Hispanic ancestry was indoctrinated by Islamists while in prison for common crimes and later charged with terrorist conspiracy.

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If we remind ourselves of the fact that every fifth American today rightly points and perhaps also with a certain degree of pride to his German ancestry or her German ancestry, we can safely say that we, indeed, share common roots.

WHITEHOUSE: President Obama and Chancellor Merkel Press Conference