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Rosemary and Peter Grant observed on the island of Daphne Major that the bird beaks on finches were affected by long periods of prolonged drought. What did the grants discovered ?
Each bird's survival was strongly influenced by the depth and strength of its beak as the drought persisted.
Which of the following is a true statement concerning genetic variation ?
A) It is created by the direct action of natural selection.
B) It arises in response to changes in the environment.
C) It must be present in the population before natural selection can act upon the population.
D) It tends to be reduced by the processes involved when diploid organisms produce gametes.
Humans today move relatively freely
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