Unit 3: Changing Ecosystems.2

What do fossils provide evidence of?

• Future changes in ecosystems

• Past changes in ecosystems

• Current changes in ecosystems

• No changes in ecosystems

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What are indicators of ecosystem changes?

• Rocks and minerals

• Sunlight and temperature

• Pollen and spores

• Water and air

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What can cause mass extinctions?

• Global cooling

• Volcanic eruptions

• Meteors causing large scale damage

• All of the above

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What do ice core samples measure?

• Sulfur levels

• Nitrogen levels

• Carbon dioxide levels

• Oxygen levels

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What does a higher carbon dioxide level in ice cores indicate?

• Lower global temperature

• Stable global temperature

• No change in global temperature

• Higher global temperature

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What do deep sea sediments trap?

• Different forms of oxygen

• Different forms of nitrogen

• Different forms of carbon

• Different forms of sulfur

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What do fossilized corals provide information about?

• Future water conditions

• No water conditions

• Past water conditions

• Current water conditions

What is required for a fossil to form?

• Predatory consumption

• Exposure to sunlight

• Quick coverage with silt

• High oxygen environment

What can the presence or absence of particular species in fossils indicate?

• No information

• The current ecosystem

• The components of the ecosystem

• The future ecosystem

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What do scientists use to measure past abiotic and biotic changes?

• Modern technology

• Weather patterns

• Animal behavior

• Fossil records

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