From oldest to youngest, they are the Hadeon, Archean, Proterozoic ... both extinct groups and modern groups of animals and plants. During the first period of the Mesozoic Era (Triassic Period ...

Scientists discovered complex life may have started 1.5 billion years earlier than previously thought thanks to phosphorus.

The ancestors of major bacterial phyla are placed in the Archaean and Proterozoic eras (2.5-1.8 billion years ago), while many families date back to 0.6-0.75 billion years ago, overlapping with the ...

The ancestors of major bacterial phyla are placed in the Archean and Proterozoic eras ... overlapping with the era when land plants and animal phyla originated. Notably, once atmospheric oxygen ...

The ancestors of major bacterial phyla are placed in the Archaean and Proterozoic eras (2.5-1.8 billion years ago), while many families date back to 0.6-0.75 billion years ago, overlapping with the ...

From oldest to youngest, they are the Hadeon, Archean, Proterozoic, and Phanerozoic eons ... that represent both extinct groups and modern groups of animals and plants. During the first period of the ...

“Beyond these most ancient milestones lies the Primordial era, whose stratigraphic ... but later than Proterozoic times there has been no complete interruption of plant and animal life, and ...

Rocks from the Cambrian Period (539-485 million years ago) record dramatic changes in Earth systems including atmospheric oxygenation, large magnitude perturbations to the carbon cycle, and the ...