Concept:An endangered species is one that faces a high risk of extinction in the near future.
Explanation:Species become endangered when their population size falls to a critically low level or continues to decline rapidly.
Such organisms are therefore likely to disappear completely from the surface of the earth unless protective measures are taken.
This definition focuses on the risk of extinction.
It is not based on migration to other lands, because migration does not mean the species will vanish globally.
It is not based on profuse reproduction, because a rapidly increasing population actually reduces the risk of extinction.
It is also not based on being dangerous to humans or attacking other animals, as many dangerous animals are not endangered.
Thus, the characteristic feature of an endangered species is the likelihood of its complete disappearance from the earth.
Answer:B. likely to disappear from the surface of the earth