Today it represents something quite different: a set of extraordinary clues, recently reinterpreted, to one of the deepest and most puzzling mysteries of life on Earth. After burbling along for ...

Life on Earth looks good ... the very first traces of life consist of microbial bacteria lacking a nucleus, while it’s widely accepted that animal organisms began more recently at about 635 ...

dramatically. It was the time of the Cambrian Explosion, an eruption of life when Earth’s very first animals began appearing in the fossil record — the ancestors of all major animal groups ...

From 4.6 billion years ago when the Earth was red hot, the timeline illustrates the evolution of the first life forms through ... How have animal skeletons adapted? videoHow have animal skeletons ...

The general scientific consensus was that complex life started on Earth approximately 635 million years ago. However, a new theory suggests that animal life may have instead begun around 2.1 ...

Over 390 million years ago, the ancestors of modern land animals said, “Feet before fins,” and took their first steps on earth ... ever before into one of life’s greatest evolutionary ...

The first creatures ... all the animals depending on that ice for hunting, resting, reproducing, and other key life activities lose the platform on which their existence depends. At the other end of ...

The earliest humans emerged about 300,000 years ago. While many of Earth’s earliest life forms have long since gone extinct, some animals have stood the test of time–surviving through mass ...