Weegy: D. 3.5 billion years. The oldest ancient fossil microbe-like objects are dated to be 3.5 Ga (billion years old), approximately one billion years after the formation of the Earth itself. User:
Two of the tenets of the cell theory are: All living things consist of one or more cells, and the cell is the smallest unit of life that displays all of the characteristics of life. Which is the third tenet?
All cells transform ... (More)