What is the primary focus of Anthony Barnosky's research?

• Understanding the background rate of extinction

• Analyzing the migration patterns of birds

• Studying the lifespan of humans

• Exploring the origins of the universe

What is an oreodont?

• A type of dinosaur

• A completely extinct group of mammals

• A type of bird

• A modern-day mammal

What makes the John Day Fossil Beds special for research?

• They have the longest record of mammalian evolution and extinction in North America

• They are the largest fossil beds in the world

• They contain the oldest fossils ever found

• They are the only fossil beds with dinosaur remains

How do scientists determine the age of rock layers at John Day Fossil Beds?

• By analyzing the color of the rocks

• By comparing them to modern-day rocks

• By using zircon crystals for radiometric dating

• By measuring the size of the fossils

Why are teeth used to identify mammalian species?

• They are the largest part of the skeleton

• They are the easiest to find

• They are the most colorful part of the fossil

• They have distinct shapes specific to each species

What is the background rate of extinction for mammals?

• Two extinctions per million species years

• Ten extinctions per million species years

• Fifty extinctions per million species years

• One hundred extinctions per million species years

How many mammal species would we expect to go extinct every 100 years based on the background rate?

• One hundred species

• Fifty species

• Ten species

• One species

What has been the rate of extinction for species in the past 100 years?

• Between 2 to 5 times too fast

• Between 10 to 20 times too fast

• Between 28 to 67 times too fast

• Between 100 to 200 times too fast

What is the potential consequence if current extinction rates continue?

• No significant impact on biodiversity

• Three out of four familiar species could be lost in three centuries

• All species will adapt and survive

• All species will become extinct in a century

What is the key to preventing the Sixth mass extinction?

• Focusing only on new species discovery

• Ignoring conservation efforts

• Increasing conservation efforts for threatened species

• Allowing natural extinction to occur