Tag: life

early life

First Animals

The sudden, but relatively late appearance of animals in the rock record has both fascinated and puzzled scientists for years. Simple bacteria emerged as early as 4000 million years ago, soon after Earth had become habitable, but complex animals appeared only around 600 million years ago and burst onto the […]

earth life timeline

Life on Earth an Inevitability? It seems so

Several recent papers present evidence that life was established early on, soon after Earth’s fiery and cataclysmic assembly had ended and its surface had cooled down into a watery world capable of sustaining life. Such an early start implies that life, rather than being unique to Earth may be, if […]