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'Basic norm ' (German: Grundnorm) is a concept in the Pure Theory of Law created by Hans Kelsen, a jurist and legal philosopher. Kelsen used this word to denote the basic norm, order, or rule that forms an underlying basis for a legal system.
Already in 1913, Kelsen had identified the need for a legal theoretic framework to support the idea of the Rechtsstaat. [5]Adolf Julius Merkl [de; pt] was a student of Kelsen's who made important contributions starting in 1918 in the area of hierarchy of norms that would help underpin some of Kelsen's ideas on norms and how they fit into his pure theory of law.
Hans Kelsen (/ ˈ k ɛ l s ən /; German: [ˈhans ˈkɛlsən]; October 11, 1881 – April 19, 1973) was an Austrian jurist, legal philosopher and political philosopher.He was the principal architect of the 1920 Austrian Constitution, which with amendments is still in operation.
A life form (also spelled life-form or lifeform) is an entity that is living, [1] [2] such as plants , animals , and fungi . It is estimated that more than 99% of all species that ever existed on Earth, amounting to over five billion species, [3] are extinct. [4] [5] Earth is the only celestial body known to harbor life forms. No form of ...
The National Autonomous University of Mexico (Spanish: Universidad Nacional Autónoma de México, UNAM) is a public research university in Mexico.It has several campuses in Mexico City, and many others in various locations across Mexico, as well as a presence in nine countries.
It involves the systematic study of any category of natural objects or organisms, [2] so while it dates from studies in the ancient Greco-Roman world and the mediaeval Arabic world, through to European Renaissance naturalists working in near isolation, today's natural history is a cross-discipline umbrella of many specialty sciences; e.g ...
Life is a quality that distinguishes matter that has biological processes, such as signaling and self-sustaining processes, from matter that does not. It is defined descriptively by the capacity for homeostasis, organisation, metabolism, growth, adaptation, response to stimuli, and reproduction.
In biology, evolution is any change across successive generations in the heritable characteristics of biological populations. Evolutionary processes give rise to diversity at every level of biological organization , from kingdoms to species , and individual organisms and molecules , such as DNA and proteins .