Which of the following scenarios best describes a density-dependent factor limiting population growth?
A) 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).
B) A particularly snowy winter makes it difficult for female deer to find food, thus affecting their ability to reproduce.
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) An April blizzard kills off many migrating barn swallows, which could not tolerate the cold and snow.
E) A homeowner sprays her lawn with broadleaf herbicide to kill the dandelions that have started growing there that spring.
Answer: A
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Loess is _____
a. commonly deposited on the upwind margins of deserts b. composed primarily of gravel-size sediment c. primarily transported by eolian suspension d. primarily transported by surface creep e. deposited out of solution from desert stream water