Final answer:
The beaks of birds are a biologically relevant character to study because they are directly related to the bird's feeding habits and food sources. By studying the beaks of birds, researchers can gain insights into the processes of natural selection and adaptation.
Step-by-step explanation:
The beaks of birds are a biologically relevant character to study because they are directly related to the bird's feeding habits and food sources. Different bird species have beaks that are adapted to their specific feeding needs. For example, birds that eat seeds have thicker, stronger beaks that can break hard nuts, while birds that eat nectar have long beaks that can reach deep into flowers.
The study of beak morphology can help scientists understand how birds have evolved and adapted to different habitats and food sources over time. By studying the beaks of birds, researchers can gain insights into the processes of natural selection and adaptation.