All living beings on earth have a common ancestor: The biosphere of the Precambrian Protoplanet can have been something like a huge global living being.
There is an interesting new hypothesis about the formation of the earth, that can explain the origin of terrestrial water and early life based upon a new theory of planet formation including a new geological explanation for the origin of the moon, the early continents, oceans and paleoclimate. The importance of silizium and water in early formation processes is part of this work. It shows that the evolution of life began much earlier than previously thought. There was an early stage of the planet called Adam Kadmon in hebrew language. Adam = earth, Kadmon = primordial.
You can find the article as free PDF with Google:
"Evolution and Geological Planet Formation - Home"
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You will find most interesting new ideas and discoveries.