How Many Mass Extinctions Have There Been?

Which event is known for causing the extinction of the non-avian dinosaurs?

• The Great Oxygenation Event

• The Cambrian Explosion

• The Permian Extinction

• The Meteorite Impact 66 million years ago

What is a significant limitation of the fossil record?

• It is unaffected by environmental conditions

• It is more complete for older periods

• It captures all life forms equally

• It only captures a small fraction of past life

Why do we have more fossils from swampy areas?

• Swampy conditions were ideal for fossil preservation

• Swampy areas were more diverse

• Swampy areas had more species

• Swampy areas are easier to excavate

How have paleontologists adjusted for inconsistencies in the fossil record?

• By only studying recent fossils

• By focusing only on the Big 5 extinctions

• By ignoring incomplete records

• By using clever statistics

What is a key factor that makes some mass extinctions more impactful than others?

• The duration of the extinction event

• The alteration of the evolutionary tree

• The size of the meteorite

• The number of species affected