U4L1E3: History of Life on Earth

HOW OLD IS THE EARTH WE LIVE IN?

• 4,6 billion years old

• 2000 YEARS OLD

• 5 BILLION YEARS OLD

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Cyanobacteria changed the early Earth's atmosphere by giving off...

• carbon dioxide

• ammonia

• hydrogen

• oxygen

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Protists were the first organisms to exhibit cell specialization, which was only possible when they...

• grew large enough

• became eukaryotic

• evolved into fungi, plants, and animals

• became multicellular

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Organisms were able to live safely on dry land after...

• cyanobacteria made oxygen, and ozone began to form

• the fifth mass extinction

• continental drift stopped

• archaebacteria made oxygen, and ozone began to form

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Each of Earth's great mass extinctions have been followed by...

• the destruction of Earth's ecosystems

• a burst of evolution

• geological and weather changes

• overpopulation of bacteria

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What is a mass extinction?

• When all the species in a particular area on earth suddenly go extinct
• When multiple species from all over the earth suddenly go extinct 
• When one species goes extinct due to habitat changes
• When all life on earth is wiped out 

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Which of the following describes what the first life form resembled?

• Eukaryotes
• Plants
• Bacteria
• Fungi

What gas was necessary for complex (eukaryotic) life to evolve?

• Carbon dioxide
• Oxygen
• Dihydrogen monoxide
• Methane

What group of organisms replaced dinosaurs after their extinction?

• Insects

• Mammals

• Amphibians

• Squids

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What is the underlying cause of every mass extinction event?

• Climate change

• Volcanic eruptions

• Diseases

• Overhunting

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