When Is a Species Is Considered to Be Critically Endangered

Multiple Choice

When is a species is considered to be critically endangered?

A) If there is a 50% probability of extinction in 5 years or 2 generations, whichever is longer
B) If there is a 50% probability of extinction in 10 years or 3 generations, whichever is longer
C) If there is a 20% probability of extinction in 20 years or 3 generations, whichever is longer
D) If there is a 20% probability of extinction in 20 years or 5 generations, whichever is longer