BIRD MIGRATION <br>
Bird migration is a seasonal large-scale movement of birds to and from their breeding grounds. Every year volunteers count migrating birds at specific locations. Scientists capture some of the birds and tag their legs with a combination of colored rings and flags. The scientists use sightings of tagged birds together with volunteers' counts to determine the migratory routes of birds. <br><br>
Most migratory birds gather in one area and then migrate in large groups rather than individually. This behavior is a result of evolution. Which of the following is the best scientific explanation for the evolution of this behavior in most migratory birds?
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A
Birds that migrated individually or in small groups were less likely to survive and have offspring.
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B
Birds that migrated individually or in small groups were more likely to find adequate food.
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C
Flying in large groups allowed other bird species to join the migration.
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D
Flying in large groups allowed each bird to have a better chance of finding a nesting site.