Complex Life on Earth May Be 1.5 Billion Years Older Than We Thought ScienceAlertContinental collision 2.1 billion years ago may have sparked ‘1st attempt’ at complex life on Earth Livescience.comComplex life forms existed 1.5 billion years earlier than previously believed, study finds ABC NewsOldest rocks on Earth may contain strange and ancient life forms New ScientistStudy claims life tried to evolve 1.5 billion years earlier than we thought Popular Science