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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.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.

www.astrobio.net/origin-and-evolution-of-life/first-signs-animal-life-earth...

Evidence suggests that microbes existed on Earth as far back as 3.7 billion years ago, a billion years after the planet formed. Animal remains, however, don’t appear in the fossil record until 600 million years ago during the Ediacaran period, though there are indirect signs that animal life may ...

www.nsf.gov/news/news_summ.jsp?cntn_id=111408

A new study mapping the evolutionary history of animals indicates that Earth's first animal--a mysterious creature whose characteristics can only be inferred from fossils and studies of living animals--was probably significantly more complex than previously believed.

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

Life on Earth was dominated by simple bacteria up until about 650 million years ago when. New research has shed fresh light on how animals first appeared on the Earth. It is a story spanning ...

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.astrobio.net/origin-and-evolution-of-life/earths-first-animal

A new study shows that Earth's first animal was probably more complex than previously believed. By analyzing massive volumes of genetic data, scientists have defined the earliest splits at the base of the animal tree of life.

en.wikipedia.org/wiki/Evolutionary_history_of_life

The evolutionary history of life on Earth traces the processes by which living and fossil organisms evolved, from the earliest emergence of life to the present. Earth formed about 4.5 billion years (Ga) ago and evidence suggests life emerged prior to 3.7 Ga. (Although there is some evidence of life as early as 4.1 to 4.28 Ga, it remains controversial due to the possible non-biological fomation ...

www.sciencedaily.com/releases/2008/04/080410153648.htm

National Science Foundation. (2008, April 11). The First Animal On Earth Was Significantly More Complex Than Previously Believed. ScienceDaily. Retrieved May 14, 2019 from www.sciencedaily.com ...

www.newscientist.com/article/dn17453-timeline-the-evolution-of-life

Timeline: The evolution of life. ... The first life may have developed in undersea alkaline vents, ... believed to be the largest land animal in Earth’s history, ...