https://www.physicsoftheuniverse.com/topics_life.html

The study of the origin of life on Earth or, more specifically, how life on Earth began ... The first living things on Earth, single-celled micro-organisms or microbes ...

https://en.wikipedia.org/wiki/Evolutionary_history_of_life

The evolutionary history of life on Earth traces the processes by which living and fossil ... These currently living species represent less than one percent of all species that have ever lived on earth. Life timeline. This box: ..... cells' "protein factories." Evidence suggests the first RNA molecules formed on Earth prior to 4.17 Ga.

https://en.wikipedia.org/wiki/Earliest_known_life_forms

The earliest known life forms on Earth are putative fossilized microorganisms found in hydrothermal vent precipitates. The earliest time that life forms first appeared on Earth is unknown. ... A life form, or lifeform, is an entity or being that is living. ... Some estimates on the number of Earth's current species of life forms range ...

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

Apr 9, 2008 ... New study shows complex creature was likely Earth's first animal.

https://www.livescience.com/57942-what-was-first-life-on-earth.html

Mar 1, 2017 ... The earliest evidence for life on Earth arises among the oldest rocks still ... a prokaryote (a single-celled organism without membrane-bound nuclei or ... that oceanic hydrothermal vents may have hosted the first living things.

https://www.khanacademy.org/science/biology/history-of-life-on-earth/the-diversification-of-life/v/first-living-things-on-land-clarification

Plants weren't our servants. They didn't move to land just to give us animals food. They moved onto land because conditions were favorable enough for them to ...

https://www.quora.com/What-was-the-first-living-organism-on-Earth-Where-did-it-come-from

There is no easy way to define what the first organism would have been, because living things would have gradually developed from molecules ...

https://www.independent.co.uk/news/science/first-animals-appear-earth-mystery-solved-scientists-snowball-bacteria-a7896641.html

Aug 16, 2017 ... 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 ...

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

Jul 14, 2009 ... The early multicellular animals undergo their first splits. First they .... The ray- finned fish thrive, and give rise to most fish species living today.

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

Nov 5, 2018 ... 575 million years ago, the Avalon explosion gave place to the emergence of the first animals over the surface of the Earth such as Dickinsonias ...