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Which one of the following represents a true “Ecological population”?

  • A.A pitcher plant and a trapped fly in it
  • B.All animals that live near each other in a national park
  • C.The leeches and the flatworms that live in a forest
  • D.All the lions in a reserve forest

Answer: D

A true ecological population is all the lions in a reserve forest.

A population is a group of individuals of the same species living in the same area at the same time and able to interbreed. All the lions in one reserve meet that definition.

A pitcher plant with its trapped fly involves two different species, which is an interaction, not a population. All the animals living near each other in a national park, or the leeches and flatworms of a forest, include several species, so they describe parts of a community rather than a population.

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