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The following outline is provided as an overview of and topical guide to life forms: A life form (also spelled life-form or lifeform) is an entity that is living, [1] [2] such as plants , animals , and fungi . It is estimated that more than 99% of all species that ever existed on Earth, amounting to over five billion species, [3] are extinct ...
The earliest evidence for life on Earth includes: 3.8 billion-year-old biogenic hematite in a banded iron formation of the Nuvvuagittuq Greenstone Belt in Canada; [30] graphite in 3.7 billion-year-old metasedimentary rocks in western Greenland; [31] and microbial mat fossils in 3.48 billion-year-old sandstone in Western Australia.
The study of abiogenesis aims to determine how pre-life chemical reactions gave rise to life under conditions strikingly different from those on Earth today. It primarily uses tools from biology and chemistry , with more recent approaches attempting a synthesis of many sciences.
In a study published in Precambrian Research Monday by scientists from Cardiff University in Wales, researchers found environmental evidence that complex life existed 1.5 billion years earlier ...
Now, another new study (led by scientists at Cardiff University) is complicating Earth’s ancient timeline even further by proposing the theory that the first forms of complex life actually ...
All earlier forms of life preceding this divergence and all extant organisms are generally thought to share common ancestry. On the basis of a formal statistical test, this theory of a universal common ancestry (UCA) is supported versus competing multiple-ancestry hypotheses.
The Zoologist's Guide to the Galaxy. What Animals on Earth Reveal about Aliens – and Ourselves is a 2020 popular science book by the Cambridge University zoologist Arik Kershenbaum. It discusses the possible nature of life on other planets, based on the study of animal life on Earth.
The age of Earth is about 4.54 billion years; [7] [33] [34] the earliest undisputed evidence of life on Earth dates from at least 3.5 billion years ago according to the stromatolite record. [35] Some computer models suggest life began as early as 4.5 billion years ago. [36] [37] The oldest evidence of life is indirect in the form of isotopic ...