Background Extinction vs. Mass Extinctions Flashcards
1
Q
Q: What is the difference between background extinction and mass extinction?
A
A: Background extinction is the gradual and ongoing loss of species due to environmental change and competition. Mass extinction is a sudden, global loss of many species at once.
2
Q
Q: How many major mass extinction events are recognized in Earth’s history.
A
A: Five major mass extinction events.
3
Q
Q: Which mass extinction event killed all non-avian dinosaurs?
A
A: The End-Cretaceous extinction, approximately 66 million years ago.
