Then about 570 billion years ago, in a time now called the Cambrian explosion, the carnival of life began.

Most of the main animal groups appeared quite suddenly 600 million years ago in what has become known as the 'Cambrian explosion'.

Complex life forms first emerged about 600 million years ago during the Cambrian explosion.

The Cambrian explosion refers to the massive increase in different body plans that took place around 530 million years ago.

These organisms are central to the debate about how abrupt the Cambrian explosion was.

Afterwards, the Cambrian explosion of new multicellular life forms started.

To hear biologists tell it, the importance of the Cambrian explosion cannot be overstated.

One such event is the famous evolutionary proliferation of animal groups called the Cambrian explosion.

His kind had evolved, according to hive memory, in that same Cambrian explosion she knew about.

The 'Cambrian explosion' is a real evolutionary event, but its origins are obscure.

Some researchers suggested that the bilaterian body plan helped set off the Cambrian explosion.

The climate quickly switched to one much warmer than today, resulting in the Cambrian explosion of life forms.

The Cambrian explosion marks the era with thousands of new life forms in the ancient seas.

The Burgess phenomenon, then, goes right back to the beginning of the Cambrian explosion.

The Cambrian explosion was the first filling of the ecological barrel for multicellular life.

The Cambrian explosion was too big, too different, and too exclusive.

We have always viewed the creatures that made the Cambrian explosion as unrelated in just this profound way.

However, the Cambrian explosion of animals that gave rise to body fossils did not happen instantaneously.

Interestingly, another major glacial episode may have ended just a few million years before the Cambrian explosion.

The Cambrian Explosion of life took place over about 15 million years in this part of the world.

They probably represent changes on a global scale, and as such may help to constrain possible causes of the Cambrian explosion.

This period saw a burst of apparently rapid evolution, dubbed the "Cambrian explosion".

The Cambrian explosion has caused much scientific debate.

Their diversity reflects major ecological events such as the appearance of predation and the Cambrian explosion.

Primitive chordates are known from at least as early as the Cambrian explosion.