Ring species demonstrate that "can interbreed with" is not transitive.
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Ring species — In biology, a ring species is a connected series of neighboring populations that can interbreed with relatively closely related populations, but for which there exist at least two end populations in the series that are too distantly related to… … Wikipedia
Ring species — Variation clinale Les variations des populations interfécondes (ici représentées par des blocs de couleurs) le long d une cline peuvent suivre une courbe, formant au final un anneau. Une variation clinale (ring species, « espèce en… … Wikipédia en Français
ring species — /ˈrɪŋ spisiz/ (say ring speeseez) noun Biology a series of connected populations, each of which can interbreed with its neighbouring populations, the series being extended to the point where the two outer populations are so genetically remote… …
Species — In biology, a species is one of the basic units of biological classification and a taxonomic rank. A species is often defined as a group of organisms capable of interbreeding and producing fertile offspring. While in many cases this definition is … Wikipedia
Species group — A species group is an informal taxonomic rank into which an assemblage of closely related species within a genus are grouped because of their morphological similarities[1][2] and their identity as a biological unit with a single monophyletic… … Wikipedia
Ring opening metathesis polymerisation — Ring opening metathesis polymerization (ROMP) is a type of olefin metathesis polymerization that produces industrially important products. The driving force of the reaction is relief of ring strain in cyclic olefins (e.g. norbornene or… … Wikipedia
Ring-tailed Pigeon — Conservation status Vulnerable (IUCN 3.1) Scientific classification Kingdo … Wikipedia
Ring-tailed ground squirrel — Conservation status Least Concern (IUCN 3.1)[1] … Wikipedia
Ring — Ring, n. [AS. hring, hrinc; akin to Fries. hring, D. & G. ring, OHG. ring, hring, Icel. hringr, DAn. & SW. ring; cf. Russ. krug . Cf. {Harangue}, {Rank} a row,{Rink}.] A circle, or a circular line, or anything in the form of a circular line or… … The Collaborative International Dictionary of English
Ring armor — Ring Ring, n. [AS. hring, hrinc; akin to Fries. hring, D. & G. ring, OHG. ring, hring, Icel. hringr, DAn. & SW. ring; cf. Russ. krug . Cf. {Harangue}, {Rank} a row,{Rink}.] A circle, or a circular line, or anything in the form of a circular line… … The Collaborative International Dictionary of English
