ED#6 Extinction Events

What is the main goal of the video discussed?

• To explore the Australian flora

• To discuss the entire geological time scale

• To explain a recent extinction event

• To name all the dinosaurs

What does ecological principle number five state?

• Extinction is caused only by human activity

• There is a pattern of normal or background extinction without any broad scale cause

• All extinctions are disastrous

• Dinosaurs are the most significant extinction event

Which extinction event is most familiar to people?

• Australian megafauna extinction

• Permian-Triassic extinction event

• Holocene extinction

• Cretaceous-Tertiary boundary event

What are the two main causes investigated for the extinction of the Australian megafauna?

• Continental drift and solar flares

• Climate change and human activity

• Asteroid impacts and volcanic eruptions

• Disease and predation

How long ago did the extinction of the dinosaurs occur?

• 100 thousand years ago

• About 65 million years ago

• 1 million years ago

• 250 million years ago

What is the significance of the Cretaceous-Tertiary boundary?

• It marks the extinction of the Australian megafauna

• It is when the most significant extinction event occurred

• It marks the beginning of human civilization

• It is when dinosaurs disappeared from the fossil record

What is a major factor affecting the flora and consequently the fauna in ecosystems?

• The availability of smartphones

• The introduction of non-native species

• Changes in climate such as aridity

• The construction of urban areas

What is the role of fire management mentioned in the context of Australian megafauna extinction?

• Fire management led to the introduction of new species

• Aboriginal people used it effectively, possibly affecting ecosystems

• It is a modern technique not related to the extinction

• It was a major cause of the extinction

What does the term 'recent' refer to in the context of extinction events?

• Events happening in the last 100 years

• The extinction of the dinosaurs

• Events that are geologically recent, which can vary in actual years

• Only events occurring after human civilization began

What is the significance of the Permian-Triassic extinction event mentioned?

• It was the least significant extinction event

• It was the most significant extinction event

• It is when humans first appeared

• It marked the appearance of the first mammals