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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 ...

en.wikipedia.org/wiki/Timeline_of_the_evolutionary_history_of_life

Pterodactyloid pterosaurs first appear: 161 Ma Ceratopsian dinosaurs appear in the fossil record and the oldest known Eutherian Mammal appear in the fossil record: Juramaia. 160 Ma Multituberculate mammals (genus Rugosodon) appear in eastern China: 155 Ma First blood-sucking insects (ceratopogonids), rudist bivalves, and cheilostome bryozoans.

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.bbvaopenmind.com/en/science/bioscience/what-were-the-first-animals-on-earth

For some four billion years, no life existed on Earth more complex than a simple cell. Then, and for reasons still unknown, about 575 million years ago multicellular life forms suddenly began to multiply.That event, named the Avalon explosion, happened after the planet left behind the frigid phase of the Cryogenian Period to enter the Ediacaran, which lasted from 635 to 542 million years ago.

naturalhistory.si.edu/.../teaching-resources/life-science/early-life-earth-animal-origins

Early Life on Earth – Animal Origins Depiction of one of Earth’s ocean communities, including the top predator Anomalocaris, during the Cambrian Period 510 million years ago. By the end of the Cambrian, nearly all the major groups of animals we know today (the phyla) had evolved. Depiction by Karen Carr, Smithsonian.

answersdrive.com/when-did-animals-first-appear-on-the-earth-1597365

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

News > Science Sea sponges were the first animals on Earth, scientists discover. Sea sponges are believed to have first appeared 640 million years ago

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

2.3 billion years ago. Earth freezes over in what may have been the first “snowball Earth”, possibly as a result of a lack of volcanic activity.When the ice eventually melts, it indirectly ...

www.answers.com/Q/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 non-aquatic life for UV radiation. (This ...

answersdrive.com/when-did-the-first-plants-appear-on-earth-1597366

When did the first plants appear on Earth? ... The evolutionary history of the comb jelly has revealed surprising clues about Earth's first animal. 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.