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What is the primary source of our knowledge about the evolution of life?

• DNA analysis

• Fossils

• Ancient texts

• Meteorites

Which part of an organism is most likely to become fossilized?

• Skin

• Bones

• Blood

• Hair

How old are the oldest bacteria found in the fossil record?

• 540 million years

• 3.5 billion years

• 65 million years

• 1 million years

What major event is characterized by the extinction of the dinosaurs?

• The end of the Paleozoic Era

• The K-T boundary

• The beginning of the Cenozoic Era

• The Permian extinction

What is the geologic time scale based on?

• The age of the Earth

• The fossil record

• The movement of tectonic plates

• The position of the stars

Which tree is an example of a species that appears in both the fossil record and exists today?

• Oak

• Pine

• Ginkgo

• Maple

What percentage of marine species went extinct during the greatest mass extinction at the end of the Paleozoic Era?

• 50%

• 70%

• 90-95%

• 100%

What is the primary cause of the current mass extinction according to the passage?

• Volcanic eruptions

• Human activity

• Asteroid impacts

• Natural climate change

How long did it take for biodiversity to recover from previous mass extinctions?

• 1 to 10 years

• 10 to 100 years

• 10 to 100 million years

• 1 to 10 million years

What is the term for the preserved remains of extinct plants and animals?

• Artifacts

• Fossils

• Relics

• Specimens