Which of the Following Scenarios Best Describes a Density -Dependent

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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