Why is the relationship between structure and function important in biological systems?

Structure refers to how the (body ) is put together-bones, muscles, tendons and ligaments - then onto organ structure, down to the cellular level-

Function refers to how does (the body ) work,what does it do ?

example-structure of an organ- the largest in the human body - skin-

epidermis, dermis,layer of fat,etc.. function- regulates body temperature , expands to allow body movement, cools body temperature, houses nerve endings ,enabling to feel pressure or pain