IUCN categorized major threatened species under : seven classes A)five classes B)six classes C)four classes D)None of these
Option D) At present, the IUCN Red List of Threatened Species (also known as the Red Data List) lists eight classes of organism under the group of "threatened categories" of endangered; critically endangered, The classes of organism for which the 'threatened' tag is applied are: mammals; birds; reptiles; amphibians; fishes; insects; mollusks; and plants.
