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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.
Timeline of computer viruses and worms (1966–present) Timeline of social media (1979/1980–present) Timeline of Linux kernel development (1991–present) Timeline of computing; Microprocessor chronology; Timeline of programming languages; History of computer science; Timeline of video game console releases; Timeline of operating systems ...
In biology, a biological life cycle (or just life cycle when the biological context is clear) is a series of stages of the life of an organism, that begins as a zygote, often in an egg, and concludes as an adult that reproduces, producing an offspring in the form of a new zygote which then itself goes through the same series of stages, the ...
Sixth Party System (1980–present) Reagan Era (1980–1991) Post-Cold War period (1991–2008) ... Logarithmic timeline shows all history on one page in ten lines.
The timeline of human evolution outlines the major events in the evolutionary lineage of the modern human species, Homo sapiens, throughout the history of life, beginning some 4 billion years ago down to recent evolution within H. sapiens during and since the Last Glacial Period.
The concept was popularized by Carl Sagan in his 1977 book The Dragons of Eden and on his 1980 television series Cosmos. [2] Sagan goes on to extend the comparison in terms of surface area, explaining that if the Cosmic Calendar were scaled to the size of a football field, then "all of human history would occupy an area the size of [his] hand".
c. 5.0 Ma – The Colorado Plateau reaches its present height, and the course of the Colorado River becomes close to the present one. c. 4.8 Ma – The mammoth appears. c. 4.2 Ma – appearance of the genus Australopithecus; c. 4 Ma – First zebras. c. 3 Ma – Isthmus of Panama joins North and South America. Great American Interchange.
Human embryonic development or human embryogenesis is the development and formation of the human embryo.It is characterised by the processes of cell division and cellular differentiation of the embryo that occurs during the early stages of development.