A mutation arises in a

  1. A mutation arises in a bird population that increases the length of its beak. Although many mutations are harmful this
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  2. A particular bird species found in North America obtains most of its food energy by catching and eating insects. A mutation
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  3. A particular bird species found in North America obtains most of its food energy by catching and eating insects. A mutation
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  4. A particular bird species found in North America obtains most of its food energy by catching and eating insects. A mutation
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  5. A particular bird species found in North America obtains most of its food energy by catching and eating insects. A mutation
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  6. A particular bird species found in North America obtains most of its food energy by catching and eating insects. A mutation
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  7. A particular bird species found in North America obtains most of its food energy by catching and eating insects. A mutation
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  8. A particular bird species found in North America obtains most of its food energy by catching and eating insects. A mutation
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  9. A particular bird species found in North America obtains most of its food energy by catching and eating insects. A mutation
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  10. A particular bird species found in North America obtains most of its food energy by catching and eating insects. A mutation
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