Because vitamins carry out various functions in the body, deficiency of different vitamins can have varied effects on the body. the primary role of vitamin d in the body is , and its deficiency may result in .

an adaptation is a change or process by which an organism takes to be better suited for its environment. for example; migration is a behavioral adaptation, this is needed because birds are not built to last extremely cold climates. there are different adaptations because there are different species needing to adjust to different things, bears don't migrate; they hibernate.

answer; polycythemia is the correct answer;