Extinction and Ecology

According to most scientists, what is the ultimate cause of most mass extinctions?

• overhunting

• evolution of new species to replace old ones

• major change in environment

• asteroid impact

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Which of the following is NOT a reason a species may become extinct?

• competition
• reproducing
• habitat loss
• overhunting

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True or False? Many scientists think that an asteroid caused the dinosaurs to go extinct.

• True

• False

Species that are in danger of becoming extinct are called __________.

• endangered

• not lucky

• extinct

• in a jam

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When a plant or animal becomes extinct, it is gone _______.

• forever

• until next week

• for 5 years

• to sleep

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Evidence of an animal or plant that lived a long time ago on Earth is called a ________.

• fossil

• tiger

• extinct

• endangered

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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.

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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 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    

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What is one of the main threats to tigers?

• Human impact

• deers are becoming extinct

• global warming

• the grass is dying

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