U3CHPT2.4

Fill in the blank: The ______ extinction event occurred approximately 370 million years ago.

• A. Cambrian

• B. Silurian

• C. Devonian

• D. Permian

Which mass extinction event is associated with the label 'C' on the graph?

• Cambrian Extinction

• Silurian Extinction

• Devonian Extinction

• Triassic Extinction

Which extinction event is labeled as 'B' on the graph?

• Cambrian Extinction

• Silurian Extinction

• Devonian Extinction

• Permian Extinction

How did the formation of Pangea affect predator-prey relationships?

• It stabilized them

• It upset them

• It had no effect

• It improved them.

Possible collisions with ______ were a cause of the mass extinction at the end of the Triassic period.

• Comets

• Meteorites

• Asteroids

• Planets

What was a significant event during the Triassic period?

• Appearance of first birds

• Appearance of first mammals

• Appearance of first reptiles

• Appearance of first amphibians

Nearly every land animal with a mass over _______ became extinct at the end of the Mesozoic Era.

• 10kg

• 25kg

• 50kg

• 100kg

The Mesozoic Era ended approximately how many million years ago?

• 100 MYA

• 60 MYA

• 200 MYA

• 150 MYA

Which period is known for the first appearance of dinosaurs?

• Permian

• Cretaceous

• Jurassic

• Triassic

What major event marked the end of the Cretaceous period?

• First appearance of mammals

• Mass extinction of dinosaurs

• Formation of Pangea

• Breakup of Pangea