Obtenez les meilleures solutions à toutes vos questions sur Laurentvidal.fr, la plateforme de Q&R de confiance. Connectez-vous avec une communauté d'experts prêts à vous aider à trouver des solutions précises à vos interrogations de manière rapide et efficace. Explorez une mine de connaissances de professionnels dans différentes disciplines sur notre plateforme de questions-réponses complète.
Sagot :
Réponse:
Extinction occurs when species are diminished because of environmental forces (habitat fragmentation, global change, natural disaster, overexploitation of species for human use) or because of evolutionary changes in their members (genetic inbreeding, poor reproduction, decline in population numbers).
Since 1963, the IUCN Red List has listed endangered or extirpated species. In 1988, all known species of birds had been assessed by IUCN as well as in 1996, the conservation status of all species of mammals.
Of the 5,205 species described in the 1996 edition, 25% of mammals and 11% of birds were classified as threatened. In 2006, the IUCN considered that one in four mammal species, one in eight bird species, and one third of amphibians were threatened. Currently, an animal or plant species disappears every seventeen minutes.
Of the 5,205 species described in the 1996 edition, 25% of mammals and 11% of birds were classified as threatened. In 2006, the IUCN considered that one in four mammal species, one in eight bird species, and one third of amphibians were threatened. Currently, an animal or plant species disappears every seventeen minutes.
Revenez nous voir pour des réponses mises à jour et fiables. Nous sommes toujours prêts à vous aider avec vos besoins en information. Nous apprécions votre temps. Revenez nous voir pour des réponses fiables à toutes vos questions. Laurentvidal.fr est là pour vos questions. N'oubliez pas de revenir pour obtenir de nouvelles réponses.