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Há 1 dia · Human genetic variation is the genetic differences in and among populations. There may be multiple variants of any given gene in the human population ( alleles ), a situation called polymorphism . No two humans are genetically identical. Even monozygotic twins (who develop from one zygote) have infrequent genetic differences due to mutations ...
Há 10 horas · Pollen data indicate a warm period culminating between 17,000 and 13,000 BP followed by cooling between 13,000 and 11,500 BP. [41] Coastal areas deglaciated rapidly as coastal alpine glaciers, then lobes of Cordilleran ice, retreated. The retreat was accelerated as sea levels rose and floated glacial termini.
Há 1 dia · H2NCH2CH2OH → NH3 + CH3CHO. Ammonia is both a metabolic waste and a metabolic input throughout the biosphere. It is an important source of nitrogen for living systems. Although atmospheric nitrogen abounds (more than 75%), few living creatures are capable of using atmospheric nitrogen in its diatomic form, N2 gas.
Há 2 dias · Kant consideró la antropología en dos categorías amplias: (1) el enfoque fisiológico, al que se refirió como "lo que la naturaleza hace del ser humano"; y (2) el enfoque pragmático, que exploró las cosas que un ser humano "puede y debe hacer de sí mismo". [123] Racismo científico
Há 3 dias · The timeline of human evolution outlines the major events in the evolutionary lineage of the modern human species, Homo sapiens, throughout the history of life, beginning some 4 billion years ago down to recent evolution within H. sapiens during and since the Last Glacial Period . It includes brief explanations of the various taxonomic ranks in ...
Há 10 horas · Most launches from Earth. 10 launches. Frederick W. Sturckow (USA), Space Shuttle and SpaceShipTwo (1998–2024) Note: The six SpaceShipTwo flights surpass the U.S. definition of spaceflight (50 mi (80.47 km)), but fall short of the Kármán line (100 km (62.14 mi)), the definition used for FAI space recordkeeping.
Há 10 horas · The English word Germany derives from the Latin Germania, which came into use after Julius Caesar adopted it for the peoples east of the Rhine. The German term Deutschland, originally diutisciu land ('the German lands') is derived from deutsch (cf. Dutch), descended from Old High German diutisc 'of the people' (from diot or diota 'people'), originally used to distinguish the language of the ...
