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Pinpointing the extinction (or pseudoextinction) of a species requires a clear definition of that species. If it is to be declared extinct, the species in question must be uniquely distinguishable from any ancestor or daughter species, and from any other closely related species.
Various theories about extinction of species, human race, social classes, etc. Extinctionism (religious concept), about extinction of sinners in the afterlife; Voluntary Human Extinction Movement (VHEMT), a movement for human extinction via antinatalism; Extinctionists, a fictional radical group in Artemis Fowl (series), book 6
The dominant account of extinction involves associative models. However, there is debate over whether extinction involves simply "unlearning" the unconditional stimulus (US) – Conditional stimulus (CS) association (e.g., the Rescorla–Wagner account) or, alternatively, a "new learning" of an inhibitory association that masks the original excitatory association (e.g., Konorski, Pearce and ...
Ceballos pointed to the extinction of the passenger pigeon, which was the only species in its genus, as an example of how losing a genus can have a cascading effect on a wider ecosystem.
Extinction risk: The probability of human extinction within a given timeframe. Extinction threat: A plausible and significant contributor to total extinction risk. Societal fragility: The potential for smaller damages to spiral into global catastrophic or extinction risk due to societal vulnerabilities, risk cascades, and maladaptive responses.
Sociology is the scientific ... be recognized as a founder of sociology as the word gained wider meaning. ... this definition is meant the human behaviour ...
Scientists are using a UC Santa Cruz greenhouse to recreate the mass extinction that wiped out the dinosaurs. They want to learn why some species survived when so many did not.
Nuclear war is an often-predicted cause of the extinction of humankind. [1]Human extinction or omnicide is the hypothetical end of the human species, either by population decline due to extraneous natural causes, such as an asteroid impact or large-scale volcanism, or via anthropogenic destruction (self-extinction), for example by sub-replacement fertility.