Some individuals of particular species of sea bird underwent genetic mutation resulting in larger beaks. After many generations almost all birds in the population had big beaks for what 2 reasons did this occur

"a.) well–developed vascular system."

loss of sensation to pressure and touch

the dorsal column–medial lemniscus pathway (dcml) (also known as the posterior column-medial lemniscus pathway (pcml)) is a sensory pathway of the central nervous system that conveys sensations of fine touch, vibration, two-point discrimination, and proprioception (position) from the skin and joints.