Dinosaurs 2

The Cambrian Explosion occurred 541 million years ago and refers to the huge and rapid _______ of life that saw most of the modern animal groups emerge.

• stagnation
• extinction
• diversification
• reduction

In Cambrian period, features such as ____ also evolved for the first time.

• ears

• eyes

• gills

• hair

By the end of ORDOVICIAN period, a mass ______

—possibly caused by cooling temperatures—wiped out many marine habitats

• extinction event
• marine diversification
• habitat restoration
• climate change event

As the supercontinent of _____ split into two separate landmasses—Laurasia and Gondwana— both climate and life on Earth changed.

• Africa

• Atlantis
• Antarctica

• Pangea

In Jurassic World dinosaurs _____on land and grew even bigger.

• struggle

• disappeared
• dominated

• remained small

The Atlantic Ocean began to appear, as the moving continents and the advancing ____ Ocean slowly separated North America from Africa.

• Tethys
• Triassic

• Gondwanian

• Laurasian

Although ___ appeared during the Jurassic,

pterosaurs such as Rhamphinion still dominated the skies.

• mammals

• carnivores

• ruminants

• birds

During the Cretaceous, the expanding Atlantic Ocean pushed North America away from Africa, while Gondwana split into South America, _____, and India.

• Africa
• Greenland
• Antarctica
• Australia

Dinosaurs evolved from small reptiles about 235 ____ years ago.

• thousand
• million
• decade
• billion

“Lizard-hipped” dinosaurs had long neck bones and often a large ____on each hand.

• tail
• finger
• claw
• scale