Answer:
genes are the building blocks for proteins
A. there is a change in Genetic frequency
DNA is found in the nucleus
B, metals, nonmentals all bond to be stable
In this question, there are no options given to choose from. So i would answer this question based on my knowledge. The most likely cause of the observed variation is adaptation and evolution. The birds of that island adapted to the food source and then they evolved as per the requirement of the place and food source.