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ARC-Challenge / Mercury_7140333 / Around areas of increased fertilizer runoff, all of the heterotrophs within a…

Problem

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question

Around areas of increased fertilizer runoff, all of the heterotrophs within a lake food chain may show an increase in numbers. After the initial increase, the populations begin to decline. Which event most likely caused the populations to decline?

choices

  • More predators were introduced into the lake.
  • Water was depleted of nutrients such as nitrogen.
  • Breeding season for the organisms came to an end.
  • Decomposing algae lowered the amount of dissolved oxygen.

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Source and history

upstream_id / Original problem ID
Mercury_7140333
task_id
264d0121-5871-5e9d-87a4-a3ac20ee9c4a
task_key
ARC~2dChallenge--test--Mercury~5f7140333
task_revision_id
1
config / split
ARC-Challenge / test

Official source

initial import