How many of America's 60 million bison remained in 1900 after intensive
hunting throughout the 1800s?
d) several hundred
What has been attached to each bison at the Tall Grass Prairie Preserve?
An ear tag with a microchip identifying each animal, to keep track
of herd composition.
What happens to prairie plants after a fire?
They are stimulated to grow.
b) They are killed.
c) They are unable to grow as high in the future.
d) None of these
What is the main research goal of Biosphere 2?
Study the effects of climate change on ecosystems.
Name two ecosystems modeled in Biosphere.
Rainforest, coral reef, Sonoran Desert, mangrove swamp, tropical
grassland, thorn scrub
How does increased carbon dioxide affect corals?
Interferes with the way they build their calcium carbonate skeletons.
Why is the answer to #6 important to the world's oceans?
Increased CO2 likely affects other organisms like shrimp, crabs
and lobsters the same way
About how many insect species are there in the world?
b) 20 million
c) 100 thousand
d) 1 billion
How many people in the world live on a dollar a day?
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