A Brief History of Life: Dinosaur Time!

What geological era followed the Great Extinction and is known for the rise of dinosaurs?

• Paleozoic

• Mesozoic

• Cenozoic

• Hadean

What feature of their skulls helps scientists classify major animal groups like Archosaurs and Diapsids?

• The size of their teeth

• The number of holes in their skulls

• The shape of their jawbones

• The thickness of their skull bones

Which group of animals are the ancestors of modern mammals?

• Archosaurs

• Diapsids

• Synapsids

• Pseudosuchians

What physiological advantage did dinosaurs have over Pseudosuchians that helped them become the dominant reptiles?

• They had stronger jaws.

• Their breathing was more efficient.

• They could fly.

• They were much larger in size.

What major event happened to Earth's landmasses during the Jurassic Period?

• All continents came together to form one supercontinent.

• Pangea began to separate into two continents, Laurasia and Gondwana.

• Continents drifted to their current positions.

• New continents were formed from volcanic activity.

Which of the following types of animals were common during the Jurassic Period?

• Mosasaurs and Ichthyosaurs

• Placental mammals and marsupials

• Sauropods, Theropods, and Stegosaurus

• Tyrannosaurus Rex and Hadrosaurs

What significant environmental change occurred during the Cretaceous Period due to seafloor spreading?

• A new ice age began.

• The Earth experienced serious global warming.

• Continents stopped moving.

• The oceans completely dried up.

What is the most widely accepted scientific explanation for the mass extinction event that ended the Mesozoic Era?

• A sudden increase in volcanic activity.

• A global disease outbreak.

• A meteor impact in the Yucatán Peninsula.

• Gradual climate change over millions of years.