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What is a biome?
a region of the biosphere
Which biome is the largest?
marine
What type of wolves live in Yellowstone?
gray
In what year were wolves reintroduced to Yellowstone?
1995
How did the reintroduction of wolves help change the hydrosphere?
Watering holes appeared
When did life first appear on Earth?
3.5 million years ago
Which part of a mountain biome has the most life?
lower regions
Why might wolves eat cattle instead of elk?
Cattle were easier to catch
Which species returned to Yellowstone after wolves were reintroduced?
beaver
How did the reintroduction of wolves help change the geosphere?
Erosion decreased
Which of the following is NOT a biome?
reef
Why might a tundra have fewer animals than a desert?
It is drier
Why did the wolves of Yellowstone go extinct?
They were hunted by humans.
Why were elk populations healthier after wolves returned to Yellowstone?
They were not overpopulated
What is the main lesson of Yellowstone?
A small change can have a big impact
Where can desert biomes often be found?
near the Equator
What was the first national park in the United States?
Yellowstone National Park
What was the role of gray wolves in Yellowstone?
top predator
Why are the poles cold?
They receive little sunlight.
Why might there be geysers in Yellowstone National Park?
There is lots of heat under the ground.
What causes patterns in the biosphere?
air and ocean currents
What is the largest biome in Yellowstone National Park?
forest
What was an effect of removing wolves from Yellowstone?
Beavers left the area
How did removing wolves from Yellowstone help scientists better understand ecosystems?
They observed the results of removing one species.
Why do humans remove top predators?
Top predators hunt humans’ livestock