Background Extinction Is a Measure of

Multiple Choice

Background extinction is a measure of

A) the rate of species turnover at the end of geological eras.
B) the number of species that suffer extinction at the beginning of geological eras.
C) the steady rate of species turnover within a lineage throughout most of their evolutionary history.
D) the lowest rate of species turnover within a lineage observed within a geological era.
E) the animals that appear in the dense forest.