Life Science, Tuesday Opener, 2.26.19

At the end of the Mesozoic Era there was a mass extinction.  Which of the following is attributed as being the main cause?

• asteroid or comet impact
• major volcanic eruption
• earthquakes
• climatic changes

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 

Which extinction is considered the largest mass extinction in Earth's history? Basically 96% of all species on Earth disappeared.

• Ordovician Extinction

• Devonian Extinction

• Permian Extinction

• Triassic Extinction

• Cretaceous Extinction

This mass extinction occurred when there was massive volcanic activity that was thought to have occurred because of an asteroid that hit Earth.

• Ordovician Extinction

• Devonian Extinction

• Permian Extinction

• Triassic Extinction

• Cretaceous Extinction

Which mass extinction included the extinction of the dinosaurs?

• Ordovician Extinction

• Devonian Extinction

• Permian Extinction

• Triassic Extinction

• Cretaceous Extinction

 Which is LEAST LIKELY to push a species toward extinction?  
         

• a.   Cutting down entire forest 
• b.  Putting animals in a zoo 
•  c.   Polluting mountain streams 
• d.   Introducing new species to an ecosystem with no known natural predator    

Humans are causing extiction in which ways?

• By over hunting animals for food or products.
• By destroying the natural habitat of species.
• By polluting the environments of the world.
• All of the above.

Which of the following was a natural factor that caused extinctions? 

• Over harvesting
• Changes in the oxygen levels
• Pollution
• Habitat destruction

Permian-triassic Extinction:

• Small marine organisms died out. (440 mya)

• Many tropical marine species went extinct. (365 mya)

• The largest mass extinction event in Earth's history affected a range of species, including many vertebrates. (250 mya)

• The extinction of other vertebrate species on land allowed dinosaurs to flourish. (210 mya)

• wiped out nonavian dinosaurs (65.5 mya) (AKA K-T extinction event)

Cretaceous-tertiary Extinction:

• Small marine organisms died out. (440 mya)

• Many tropical marine species went extinct. (365 mya)

• The largest mass extinction event in Earth's history affected a range of species, including many vertebrates. (250 mya)

• The extinction of other vertebrate species on land allowed dinosaurs to flourish. (210 mya)

• wiped out nonavian dinosaurs (65.5 mya) (AKA K-T extinction event)