Which of the Following Scenarios Best Describes a Density -Dependent

question 37

Multiple Choice

Which of the following scenarios best describes a density -dependent factor limiting population growth?

• A)An April blizzard kills off many migrating barn swallows,which could not tolerate the cold and snow.
• B)A particularly dry summer shrinks and dries up many ponds in central Canada,causing increased aggression and competition for limited nest sites among female common goldeneyes (ducks).
• C)A tropical storm strikes one of the Hawaiian Islands and wipes out a population of nénés that had been recovering from near -extinction.
• D)A particularly snowy winter makes it difficult for female deer to find food,thus affecting their ability to reproduce.
• E)A homeowner sprays her lawn with broadleaf herbicide to kill the dandelions that have started growing there that spring.

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