Life Science, Wednesday Opener, 2.27.19

At the end of the Mesozoic Era (Cretaceous Period) there was a mass extinction that killed most of the dinosaurs.

Which of the following is attributed as being the main cause?

• asteroid or comet impact

• major volcanic eruption

• earthquakes

• climatic changes

What word do we use to describe a species which has no members still living?

• endangered
• extinct

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 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.

How can you help prevent extinctions?

• By not polluting our environment.
• By protecting sensitive habitats and species.
• By not eating or buying products from endangered animals.
• 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

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

• fossil

• tiger

• extinct

• endangered

This classification of risk means that the species is at serious risk of extinction.

• threatened

• vulnerable

• endangered

• extinct

The status of a "threatened species" means:

• they are almost extinct

• they are likely to become endangered

• they are extinct

• their numbers are increasing