The population of elk in Yellowstone A) reflects top-down and ...

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The population of elk in Yellowstone
 
  A) reflects top-down and bottom-up population regulation.
  B) has survived because of the elimination of keystone predator species.
  C) would have been more stable if there had only been one predator species.
  D) would be better off if all predators were eliminated from the park.

Question 2

With all of the sun's energy striking the Earth every second of every day, why doesn't the Earth overheat and kill all life living on it?
 
  A) The Earth is so large and dense that it absorbs all of this heat.
  B) The Earth is overheating regionally, melting rocks into the lava of volcanoes.
  C) The Earth maintains a balance by radiating this heat back into space.
  D) The atmosphere of the Earth prevents the solar radiation from reaching the Earth's surface.

[kjo;oj]

Answer to Question 1

A

Answer to Question 2

C

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TYSM

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Gracias!