Which of the following events resulted in the most species extinctions overall? a) Ordovician-Silurian
b) Cretaceous-Tertiary
c) End Permian
d) End Triassic

What groups are bryan drawing a contrast between ? check all that apply a. people in the city and people in the country b. people who are educated and people who are not c. people who are in favor of free silver and people who want the gold standard d. people who work and people who don't