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For example, there are two inclusions of root systems of A 2 in G 2, either as the six long roots or the six short roots. However, the nodes in the G 2 diagram correspond to one long root and one short root, while the nodes in the A 2 diagram correspond to roots of equal length, and thus this map of root systems cannot be expressed as a map of ...
This glossary of biology terms is a list of definitions of fundamental terms and concepts used in biology, the study of life and of living organisms.It is intended as introductory material for novices; for more specific and technical definitions from sub-disciplines and related fields, see Glossary of cell biology, Glossary of genetics, Glossary of evolutionary biology, Glossary of ecology ...
Flicka, a horse in a series of film adaptations, My Friend Flicka (1943), Thunderhead, Son of Flicka (1945), and Green Grass of Wyoming (1948) Flicka, a horse in the 1956-1957 television series My Friend Flicka; Flicka, the horse in the 2006 American film Flicka and its sequels, Flicka 2 (2010) and Flicka: Country Pride (2012)
Sierpiński-Dynkin's π-𝜆 theorem: [3] If is a π-system and is a Dynkin system with , then {}.. In other words, the 𝜎-algebra generated by is contained in . Thus a Dynkin system contains a π-system if and only if it contains the 𝜎-algebra generated by that π-system.
The pygmy mammoth is an example of insular dwarfism, a case of Foster's rule, its unusually small body size an adaptation to the limited resources of its island home. A biological rule or biological law is a generalized law , principle , or rule of thumb formulated to describe patterns observed in living organisms.
Another example would be the case of the fairy prion (Pachyptila turtur) that forms a close association with a medium-sized reptile, the tuatara (Sphenodon punctatus). [16] These reptiles share the burrows made by the birds, and often stay when the birds are present which helps maintain a higher body temperature. [ 16 ]
An example is thermo-regulation in Sauropsida, which is the clade containing the lizards, turtles, crocodiles, and birds. Lizards, turtles, and crocodiles are ectothermic (coldblooded), while birds are endothermic (warmblooded). Being coldblooded is symplesiomorphic for lizards, turtles, and crocodiles, but they do not form a clade, as ...
Lekking was originally described in the Tetraonidae (grouse, boldface in cladogram), in particular the black grouse (Swedish: "orrlek") and capercaillie (Swedish: "tjäderlek"), but it is widely distributed phylogenetically among other birds, and in many other animal groups within the vertebrates and the arthropods, as shown in the cladogram.