Species which are at the verge of extinction are called
Endangered
The correct option is B:
Explanation of the correct option:
Endangered- The species which are on the verge of extinction and require protection and conservation are called endangered species. e.g. blue whales, and Indian rhinoceros.
Explanation of the incorrect options:
Option A:
Extinct- The species which are no more exist on the earth are called extinct species. e.g. dodo.
Option C:
Endemic- The species of plants and animals that are found exclusively in a particular area and do not occur naturally anywhere else. Such species are called endemic species to that state, country, or geographical area. For example - the Asiatic lion (Babbar sher) is endemic to Gir forests in Gujarat.
Thus, Species that are on the verge of extinction are called endangered.