Every fall, clusters of hundreds of Danaus plexippus, or Monarch butterflies, migrate into Mexico. The traveling group of D. plexippus is one example of a(n) _______.

A population is a group of individuals of the same species living in a particular area. The migrating Monarch butterflies are all Danaus plexippus, so they form a population. An ecosystem or community includes multiple kinds of organisms, while a biome is a large region defined by its climate and characteristic life.

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