Which group of vertebrates comprises the highest number of endangered species?
A. mammals
B. fishes
C. reptiles
D. birds
Answer:A
Which group of vertebrates comprises the highest number of endangered species?
A. mammals B. fishes C. reptiles D. birds
Explanation: A taxon is endangered when its populations have decreased or habitats have been reduced to the levels that pose immediate danger of extinction. They are not likely to survive if the factors threatening their extinction continue. IUCN Red List (2004) documents the extinction of 784 species (including 338 vertebrate species, 359 invertebrate species and 87 plant species) in the last 500 years.