But it was not as rapid as an explosion: the changes seems to have ... It has long been suspected that the sparseness of the pre-Cambrian fossil record reflects these two problems.

Imagine a world teeming with life, but not as we know it—a planet bursting with creatures so bizarre they seem plucked ...

The Cambrian Explosion saw an incredible diversity of life emerge, including many major animal groups alive today. Among them were the chordates, to which vertebrates (animals with backbones ...

Then, about 540 million years ago, something else changed ... dramatically. It was the time of the Cambrian Explosion, an eruption of life when Earth’s very first animals began appearing in the ...

The fossils here record an explosion of life around 540 million years ago, during the Cambrian period, known as the ‘Cambrian explosion’. He explains a speculative theory that the evolution of ...

This expansion might have contributed to the subsequent diversification of body plans in the Cambrian explosion. In the evolution of metazoans, sponges diverged first, followed by cnidarians ...

But it was not as rapid as an explosion: the changes seems to have ... It has long been suspected that the sparseness of the pre-Cambrian fossil record reflects these two problems.