Evidence for Evolution.pdf

Natural selection has been documented in nature many times.In Galapagos finches, available seed sizes change with differentamounts of rainfall. Dry years result in more large seeds. Wetyears result in more smaller seeds. Studies of reproductivesuccess in finches indicate that large-billed birds have higherfitness in dry years, and small-billed birds have higher fitness inwet years. Fitness is reflected in the offspring produced duringwet and dry years. The pattern is repeatable and predictable.11