Species
Inbiology,aspecies(plural: species) is ane o the basic units obiological classificationan ataxonomic rank.A species is aften defined as the lairgest group oorganismsthat caninterbreedanproducinfertileaffspring.While, in mony cases, this defineetion is adequate, the difficulty o definin species is kent as thespecies problem.Differin measures is aften uised, lik similarity o DNA, morphology, or ecological niche. Presence o specific locally adaptit traits mey forder subdivide species intae "infraspecific taxa"liksubspecies(an inbotanyithertaxais uised, likvarieties,subvarieties, anformae).