The Cretaceous extinction that wiped out 60 of Earth's species ...

[frankwu]

The Cretaceous extinction that wiped out 60 of Earth's species (including the dinosaurs) is attributed to
 
  A) the break-up of Pangaea.
  B) meteorite bombardment.
  C) massive volcanic eruptions.
  D) all of the above

Question 2

During the Cenozoic, animals grew to great sizes and proportions. The woolly mammoth and the saber tooth tiger were much larger than animals we see today. Some of the causes for their extinction may be
 
  A) the emergence of man and competition for food.
  B) burning of the grasslands, severe climatic change, and man's emergence.
  C) dwindling food supplies, extreme climatic variation, and man's emergence.
  D) the extensive ice sheets that covered the land surface.

[JaynaD87]

Answer to Question 1

Answer: D

Answer to Question 2

Answer: C

[frankwu]

Thank you!

[JaynaD87]

Always glad to help...