12. Each of Earth's mass extinctions a. wiped out at least half of Earth's existing species
b. caused a drop in background extinction rates
was followed by a decrease in biodiversity

blue

light-years

magnitude

primary succession occurs in essentially lifeless areas regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. secondary succession occurs

a plastic spoon that has a temperature of 78° f is placed into a bowl of soup that has a temperature of 84° f. which of these correctly describes what will happen?

energy as heat moves from the soup to the spoon.