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...retaceous%E2%80%93Tertiary_extinction_event Cretaceous–Tertiary extinction event], which marked the demise of the [https://en.wikipedia.org/wiki/Dinosaur di ...ach era on the scale is separated from the next by a [[Catastrophism|major event]] or [[change]].</center>

...n years ago), when the Cretaceous–Tertiary [[extinction]] event caused the extinction of most dinosaur [[species]], except for some birds. The [[fossil]] record ...aurs have been the [[planet]]'s [[dominant]] flying vertebrate since the [[extinction]] of the [https://en.wikipedia.org/wiki/Pterrosaurs pterosaurs]. Although g

...number of individuals, that population is threatened with extinction; the extinction of a species can approach when all biocenoses composed of individuals of th ...may relate to one unique species or to many species, as in an [[Extinction event]]. Lastly, an ecological crisis may be local (as an oil spill) or global (a

...gation|inherited independently]]. However, as only about one recombination event occurs per million [[base pair]]s in humans, genes close together on a chro ...mosomes is represented by a pair already. An example of such a speciation event is when the plant species ''[[Arabidopsis thaliana]]'' and ''Arabidopsis ar