What part of a building performs a function that is most similar to that of the skeletal system

Like the steel framework of a building, the functions of the skeleton and the bones is to provide rigidity, which gives the body shape and supports the weight of the muscles and organs. Without this structure, the body would collapse in on itself, compressing the lungs, heart and other organs--impairing their function.

answer: proteins

explanation: complement is   system of circulate in the blood in a inactive form

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