Q.

IUCN categorized major threatened species under :

A. seven classes
B. five classes
C. six classes
D. Eight classes
Answer» D. Eight classes
Explanation: 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.
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