- Random mutations would lead to stronger beaks.
- The beaks would gradually strengthen and become more robust through use, and this trait would be inherited.
- Only birds with naturally stronger beaks would survive.
- The environment would directly cause the beak to strengthen.
67. A species of bird lives in an environment where it frequently uses its beak to crack open hard nuts. According to Lamarck’s theory, how would its beak evolve?
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