PBS Eons How did dinosaurs get so huge?

Why is it difficult for us to imagine the size of some extinct dinosaurs?

• Because they were all very small.

• Because they were invisible.

• Because they were as tall as a five-story building.

• Because they lived in the water.

Which animal holds the record for the largest terrestrial mammal?

• Paraceratherium

• Blue whale

• Supersaurus

• Sauroposeidon

What is the largest known dinosaur?

• Sauroposeidon

• Supersaurus

• Patagotitan

• Argentinosaurus

What is a key difference in reproduction between large mammals and dinosaurs?

• Both mammals and dinosaurs lay eggs.

• Dinosaurs lay eggs while mammals give birth to live young.

• Both mammals and dinosaurs give birth to live young.

• Mammals lay eggs while dinosaurs give birth to live young.

How long do elephants carry their babies?

• One year

• Two years

• Three years

• Four years

What feature did dinosaur skeletons have that helped them grow large?

• Air sacs

• Extra muscles

• Hollow bones

• Dense bones

Which group of dinosaurs had the air sac system?

• Theropods

• All dinosaurs

• Ornithischians

• Saurischians

What is the main advantage of the air sac system in dinosaurs?

• It helped them swim.

• It helped them fly.

• It made their bones lighter without sacrificing strength.

• It made their bones stronger.

Which group of dinosaurs includes today's birds?

• Ornithischians

• Theropods

• Sauropods

• Titanosaurs

What is one possible reason why dinosaurs grew so large?

• To dig deeper burrows

• To fly

• To swim faster

• To stay safe from predators