Which living organisms most resemble the common ancestor of all life according to genetic testing?

Question

Quizplus · Accepted Answer

Organisms living deep in the oceans around seafloor volcanic vents and in hot springs, particularly archaea, have been found to have genetic similarities to the common ancestor of all life. These environments are thought to resemble the conditions on Earth when life first originated, making it likely that organisms living in these extreme environments have retained genetic characteristics similar to the earliest life forms.

Which Living Organisms Most Resemble the Common Ancestor of All