Question

guided practice
a species becomes extinct when ______.
a. one population dies
b. its ecosystem is disturbed
c. its geographical range is limited
d. all its populations die

Explanation:

A species is defined as extinct when no individuals of that species remain anywhere on Earth. This means all populations of the species have died out; losing one population, a limited range, or a disturbed ecosystem does not mean the entire species is extinct.

Answer:

D. all its populations die