Final answer:
Functionalism is the school of thought in anthropology that stresses the interrelationship among the natural conditions in the environment and society.
Step-by-step explanation:
In anthropology, the school of thought that stresses the interrelationship among the natural conditions in the environment and society is functionalism. Functionalism sees society as a structure with interrelated parts designed to meet the biological and social needs of individuals. It recognizes that different parts of culture work together as a system to fulfill society's needs.