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The history of life on Earth traces the processes by which living and fossil organisms evolved, from the earliest emergence of life to present day. Earth formed about 4.5 billion years ago (abbreviated as Ga, for gigaannum) and evidence suggests that life emerged prior to 3.7 Ga. [1] [2] [3] The similarities among all known present-day species ...
The origin of life on Earth was at least 3.5 billion years ago, possibly as early as 3.8-4.1 billion years ago. [2] [3] [4] Since its emergence, life has persisted in several geological environments. The Earth's biosphere extends down to at least 10 km (6.2 mi) below the seafloor, [10] [11] up to 41–77 km (25–48 mi) [12] [13] into the ...
539 Ma – present. The Phanerozoic Eon (Greek: period of well-displayed life) marks the appearance in the fossil record of abundant, shell-forming and/or trace-making organisms. It is subdivided into three eras, the Paleozoic, Mesozoic and Cenozoic, with major mass extinctions at division points.
Life is a quality that distinguishes matter that has biological processes, such as signaling and self-sustaining processes, from matter that does not. It is defined descriptively by the capacity for homeostasis, organisation, metabolism, growth, adaptation, response to stimuli, and reproduction. All life over time eventually reaches a state of ...
Abraham Lincoln was born on February 12, 1809, in a one-room log cabin on the Sinking Spring farm, south of Hodgenville in Hardin County, Kentucky. His siblings were Sarah Lincoln Grigsby and Thomas Lincoln, Jr. After a land title dispute forced the family to leave in 1811, they relocated to Knob Creek farm, eight miles to the north.
Early life of Isaac Newton. Sir Isaac Newton at 46 in Godfrey Kneller 's 1689 portrait. The following article is part of a biography of Sir Isaac Newton, the English mathematician and scientist, author of the Principia. It portrays the years after Newton's birth in 1642, his education, as well as his early scientific contributions, before the ...
In relation to biological organisms. Zygote, at the start of an organism's life. Embryo, early in an organism's life. Foetus, early in an animal's life, occurring before birth. Larva, an early stage in many animal life forms before maturity. Child, early human life.
Early life and career of Julius Caesar. The career of Julius Caesar before his consulship in 59 BC was characterized by military adventurism and political persecution. Julius Caesar was born on 12 July 100 BC into a patrician family, the gens Julia, which claimed descent from Iulus, son of the legendary Trojan prince Aeneas, supposedly the son ...