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The timeline of the evolutionary history of life represents the current scientific theory outlining the major events during the development of life on planet Earth. Dates in this article are consensus estimates based on scientific evidence , mainly fossils .
Microevolution – Change in allele frequencies that occurs over time within a population; Evolutionary game theory – Application of game theory to evolving populations in biology; Fitness landscape – Model used to visualise relationship between genotypes and reproductive success; Genetic genealogy – DNA testing to infer relationships
The illustration is part of a section of text and images commissioned by Time-Life Books for the Early Man volume (1965) of the Life Nature Library, by F. Clark Howell. [4] The illustration is a foldout entitled "The Road to Homo Sapiens". It shows a sequence of figures, drawn by natural history painter and muralist Rudolph Zallinger (1919 ...
The technology adoption lifecycle is a sociological model that describes the adoption or acceptance of a new product or innovation, according to the demographic and psychological characteristics of defined adopter groups. The process of adoption over time is typically illustrated as a classical normal distribution or "bell curve".
The model of a tree is still considered valid for eukaryotic life forms. Trees have been proposed with either four [ 25 ] [ 26 ] or two supergroups. [ 27 ] There does not yet appear to be a consensus; in a 2009 review article, Roger and Simpson conclude that "with the current pace of change in our understanding of the eukaryote tree of life, we ...
The history of life on Earth traces the processes by which living and extinct organisms evolved, from the earliest emergence of life to the 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 indicate that they have diverged through the ...
Aging and developmental change, therefore, are continuous processes that are experienced throughout life. As such, the life course reflects the intersection of social and historical factors with personal biography and development within which the study of family life and social change can ensue (Elder 1985; Hareven 1996).
In the 1970s palaeontologists Niles Eldredge and Stephen Jay Gould developed a theoretical model that suggests that evolution, although a slow process in human terms, undergoes periods of relatively rapid change (ranging between 50,000 and 100,000 years) [80] alternating with long periods of relative stability.