Earths Evolution

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What characteristic defined many animals that evolved during the Cambrian Explosion?

• Soft bodies

• Hard body parts

• Aquatic respiration

• Terrestrial locomotion

Which event, occurring 250 million years ago, was Earth's greatest mass extinction, wiping out about 90% of all species?

• The Ordovician-Silurian Extinction

• The Cretaceous-Paleogene Extinction

• The Great Dying

• The Cambrian Extinction

Approximately when did the first dinosaurs appear, and for how long did they dominate the land?

• 300-250 million years ago, ruling for 100 million years

• 240-230 million years ago, ruling for 150 million years

• 150-100 million years ago, ruling for 50 million years

• 66 million years ago, ruling for 10 million years

What was a significant development in early human history that occurred approximately 800,000 years ago?

• The development of the first known tools

• The ability to walk upright

• The discovery of how to control fire

• The extinction of other human species