Cultural relativism

Boas and Benedict were both major proponents of cultural relativism in the first half of the 20th century. How does their support of cultural relativism come through in their writing? What evidence does Boas’ article on “Altering Sounds” or Benedict’s chapter in “Patterns of Culture” provide in support of cultural relativism? What are the main argument is in each of their respective readings. How does it relate to cultural relativism?