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en.wikipedia.org/wiki/Timeline_of_the_evolutionary_history_of_life

This timeline of the evolutionary history of life represents the current scientific theory outlining the major events during the development of life on planet Earth.In biology, evolution is any change across successive generations in the heritable characteristics of biological populations. Evolutionary processes give rise to diversity at every level of biological organization, from kingdoms to ...

www.independent.co.uk/news/science/first-animals-appear-earth-mystery-solved...

New research has shed fresh light on how animals first appeared on the Earth. It is a story spanning hundreds of millions of years, of entire mountain ranges ground to dust by vast glaciers that ...

www.reference.com/history/did-first-animals-appear-earth-39f07298df741d3f

Complex animals began evolving approximately 550 million years ago, followed by the first life making its way onto land approximately 50 million years later. Life evolved at a steady pace on the Earth, developing a great deal of diversity as new environments and niches became populated by new forms of life.

www.bbc.com/earth/story/20150112-did-snowball-earth-make-animals

The evidence for a Snowball Earth first emerged in the early 1990s. Unexpectedly, geologists discovered evidence of glaciers – such as stones that had clearly been carried on ice rafts and then ...

www.answers.com/Q/When_did_the_first_animal_appear_on_earth

When did the first animal appear on earth? During the Silurian era the first simple animals began to appear on land. It is thought that this is due to the development of the Ozone layer protecting ...

www.answers.com/Q/When_did_the_first_animal_appeared_on_earth

This is when ancient animals would gradually change forms over a long period of time.the first land animals appear on earth? About 417 million years age during the Devonian era. As for creationism ...

www.independent.co.uk/news/science/sea-sponge-oldest-animal-on-earth-a6891511.html

The first animal to appear on Earth was probably the humble sea sponge, American scientists believe. According to researchers at the world-famous Massachusetts Institute of Technology (MIT), sea ...

explorecuriocity.org/.../who-were-the-very-first-animals-to-set-foot-on-the-earth-166.aspx

They were certainly awesome looking creatures, unlike anything we see today. Roaming the earth some 230 million years ago, they are commonly thought to be one of the first animals in the world. But the first animals on earth actually appeared about 400 million years earlier than dinosaurs and they were discovered right here in Canada!

www.livescience.com/4880-shock-animal-earth-surprisingly-complex.html

Earth's first animal was the ocean-drifting comb jelly, not the simple sponge, according to a new find that has shocked scientists who didn't imagine the earliest critter could be so complex.