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Succession and Extinction — Unit test Answers

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Earth’s biosphere is described as

A
every biome that has living things.
B
every community that is above water.
C
every biome that has living plants.
D
every community that has sunlight.
22
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Which factor can cause secondary succession?

A
clear cutting
B
glacial melting
C
competition
D
predation
23

Which statement best describes an effect of large asteroid and comet impacts?

A
They cause Earth's tectonic plates to stop moving.
B
They can create large craters on Earth's surface.
C
They only affect small, isolated areas.
D
They have no impact on organisms.
24

On May 18, 1980, Mount St. Helens in Washington State experienced a huge volcanic eruption after a magnitude 5.1 earthquake. During the eruption, hot ash and pumice poured down the west, south, and east sides of the mountain, melting the snow and ice at the top of the volcano and producing volcanic mudflows. Which type of process first occurred in the ecosystem around Mount St. Helens after it erupted?

A
primary succession
B
secondary succession
C
a climax community
D
species extinction
25

What event might occur when favorable adaptations build up in a population over many generations?

A
starvation
B
extinction
C
migration
D
speciation

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