Question

multiple choice 1 point
extinction is defined as:
a decrease in an organisms population size
the migration of a species to new regions
the disappearance of a species from earth
the appearance of a new species

Explanation:

Extinction refers to the complete disappearance of a species from the Earth. A decrease in population size is just a decline, not extinction. Migration is movement to new regions, not disappearance. The appearance of a new species is speciation, not extinction.

Answer:

The disappearance of a species from Earth.