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Although there are many fossil species, the only species surviving today is the aardvark, Orycteropus afer. Orycteropodidae is recognized as the only family within the order Tubulidentata, from the Latin words tubulis (tubule) and dentis (tooth), referring to the tubule-style teeth. [3], so the two are effectively synonyms. [1] [4]
Spectacled bears are the only surviving species of bear native to South America, and the only surviving member of the subfamily Tremarctinae, the short-faced bears. Their range is the Andean Mountains from Venezuela to Chile.
Handedness: It is unclear how handedness develops, what purpose it serves, why right-handedness is far more common, and why left-handedness exists. Laughter : While it is generally accepted that laughing evolved as a form of social communication, the exact neurobiological process that leads humans to laugh is not well understood.
A survivorship curve is a graph showing the number or proportion of individuals surviving to each age for a given species or group (e.g. males or females). Survivorship curves can be constructed for a given cohort (a group of individuals of roughly the same age) based on a life table .
This is an accepted version of this page This is the latest accepted revision, reviewed on 27 January 2025. Problem of the lack of evidence for alien life despite its apparent likelihood This article is about the absence of clear evidence of extraterrestrial life. For a type of estimation problem, see Fermi problem. Enrico Fermi (Los Alamos 1945) The Fermi paradox is the discrepancy between ...
Insects make up the vast majority of animal species. [14]Chapman, 2005 and 2009 [9] has attempted to compile perhaps the most comprehensive recent statistics on numbers of extant species, drawing on a range of published and unpublished sources, and has come up with a figure of approximately 1.9 million estimated described taxa, as against possibly a total of between 11 and 12 million ...
The species is also known from numerous remains from the classical range of Elasmotherium, and some sources have considered this species to be a synonym of E. caucasicum, but it is currently considered distinct. [3] It is mainly found in the Psekups faunal complex between 2.2 and 1.6 Ma, [3] and additional remains from Shaanxi were described in ...
Functional extinction is the extinction of a species or other taxon such that: It disappears from the fossil record, or historic reports of its existence cease; [1] The reduced population no longer plays a significant role in ecosystem function; [2] [3] [4] The population is no longer viable.