age of life on earth
", "Oldest traces of life on Earth found in Quebec, dating back roughly 3.8 billion years", "Oldest fossil found: Meet your microbial mom", "Microbially Induced Sedimentary Structures Recording an Ancient Ecosystem in the ca. Mass extinction of 70% of dominant sea plants. The timeline of life on earth begins over 4.5 billion years ago. ", Philosophical Transactions of the Royal Society B, "Early life on land and the first terrestrial ecosystems", "Bacteriophage T4 genetic homologies with bacteria and eucaryotes", "Eukaryotic organisms in Proterozoic oceans", "First Land Plants and Fungi Changed Earth's Climate, Paving the Way for Explosive Evolution of Land Animals, New Gene Study Suggests", 10.1666/0094-8373(2000)026<0386:BPNGNS>2.0.CO;2, "Is This the First Fossil of an Embryo? ", "Researchers find that Earth may be home to 1 trillion species", "The Burgess Shale & Models of Evolution", "Measuring the sixth mass extinction - Cosmos", "The biotic crisis and the future of evolution", "Life's Building Blocks May Have Formed in Dust Around Young Sun", "Evidence for early life in Earth's oldest hydrothermal vent precipitates", "Scientists Say Canadian Bacteria Fossils May Be Earth's Oldest", "Earliest evidence of life on Earth 'found, "Canadian bacteria-like fossils called oldest evidence of life", "Microbial habitability of the Hadean Earth during the late heavy bombardment", "Hints of life on what was thought to be desolate early Earth", "Potentially biogenic carbon preserved in a 4.1 billion-year-old zircon", "When did eukaryotic cells (cells with nuclei and other internal organelles) first evolve?  In July 2020, marine biologists reported that aerobic microorganisms (mainly), in "quasi-suspended animation", were found in organically-poor sediments, up to 101.5 million years old, 250 feet (76.2 m) below the seafloor in the South Pacific Gyre (SPG) ("the deadest spot in the ocean"), and could be the longest-living life forms ever found. Occasionally biodiversity on Earth takes a hit in the form of a mass extinction in which the extinction rate is much higher than usual. Wrinkled Kinneyia-type sedimentary structures formed beneath cohesive microbial mats in peritidal zones.. Homo sapiens began walking the African continent around 300,000 years ago and continues to exist to date.Homo sapiens is the most advanced of all living species on the planet. 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. It makes sense the first signs of life on planet earth are incredibly simple.  Moreover, there are more individual viruses than all the estimated stars in the universe; which, in turn, are considered to be more numerous than all the grains of beach sand on planet Earth. Researchers have identified five major extinction events in earth's history since:, (Dates and percentages represent estimates. That event led to the loss of most of the planet's obligate anaerobes. Earth’s life first emerged. ), Smaller extinction-events have occurred in the periods between these larger catastrophes, with some standing at the delineation points of the periods and epochs recognized by scientists in geologic time. A large extinction-event often represents an accumulation of smaller extinction- events that take place in a relatively brief period of time.  These organisms generated Adenosine triphosphate (ATP) by exploiting a proton gradient, a mechanism still used in virtually all organisms.. The earliest life on Earth appeared during the Precambrian supereon, which began when the Earth was formed and ended about 550 million years ago.. Fossils show that simple cells, known as prokaryotes, appeared on Earth between about three and a half and four billion years ago..  In July 2018, scientists reported that the earliest life on land may have been bacteria 3.22 billion years ago.  The Earth's biosphere extends down to at least 19 km (12 mi) below the surface, and up to at least 76 km (47 mi) into the atmosphere, and includes soil, hydrothermal vents, and rock. 3.48 Billion-Year-Old Dresser Formation, Pilbara, Western Australia", "The Last Universal Common Ancestor: emergence, constitution and genetic legacy of an elusive forerunner", "Proton Gradient, Cell Origin, ATP Synthase - Learn Science at Scitable", "When did oxygenic photosynthesis evolve? From 251.4 Ma to 66 Ma and containing the Triassic, Jurassic and Cretaceous periods. , The age of the Earth is about 4.54 billion years; the earliest undisputed evidence of life on Earth dates from at least 3.5 billion years ago. 2500 Ma – 542 Ma. Manifestations of changes within Earth’s interior—such as the develop-ment of mountains and volcanoes—have a huge influ- , Species go extinct constantly as environments change, as organisms compete for environmental niches, and as genetic mutation leads to the rise of new species from older ones. Occasionally biodiversity on Earth takes a hit in the form of a mass extinction in which the extinction rate is much higher than usual.
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