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en.wikipedia.org/wiki/Timeline_of_evolutionary_history_of_life

The first known mass extinction in earth's history was the Great Oxygenation Event 2.4 billion years ago. That event led to the loss of most of the planet's obligate anaerobes. Researchers have identified five major extinction events in earth's history since:

themysteriousworld.com/top-10-oldest-animal-species-on-earth

Evolution of animals merely depends upon environmental conditions of Earth. When digging down the history of Earth, we can see some animal species manage to thrive upon THE different geological time span of Earth, developed before million of years ago. Here the list of top 10 oldest animal species on Earth.

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

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.newser.com/story/221214/meet-earths-first-animal.html

Way before humans, sharks, or dinosaurs, the sea sponge was very likely the first animal on Earth. That's according to a PNAS study out of MIT concluding that a molecule in 640 million-year-old...

www.answers.com/Q/What_was_the_first_animal_on_earth

However, the exact nature of the first animal on earth is not known. share with friends. Share to: What was the first animal that return to earth aftr space travell?

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 April 16, 2019 from www.sciencedaily.com ...

allthatsinteresting.com/first-animal-on-earth

It’s been confirmed: the first animal to ever evolve on Earth is… the sea sponge. We realize this might be a little disappointing, but wait, there’s more! Real life sea sponges will never be as popular as Sponge Bob, but they are much more interesting than you might first assume.

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

The evidence for a Snowball Earth first emerged in the early 1990s. ... of a hard Snowball Earth anymore . Biologists have long known that animals are more likely to help close relatives, because ...

news.nationalgeographic.com/news/2012/120207-oldest...

As possibly the first muticellular animals, ... The fossil record indicates Otavia survived at least two long-term, severe cold snaps known as "snowball Earth" events, ...

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 ...