Evolution Natural Selection
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Before, some birds had hollow bones and some birds had solid bones.
The birds with hollow wings were able to fly, but the birds with solid bones weren't able to fly because their bones are too heavy.
The birds that are able to fly are able to hunt for food and escape from predators easily.
The birds that are unable to fly die off because they have no access to resources and are easy prey for predators.
The birds that have survived reproduce baby birds that also have hollow bones.
Eventually the entire population consists of hollow - boned birds.
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