What is a structure in science?

Answer 1

A structure has the purpose of enclosing or supporting. Thus the cell wall is a structure, as a butterfly wing. A spider leg has a support function.

It is possible that other functions may be included within a structure - transpiration for example.

Your skin is often described as the largest organ in your body, but it incorporates other functions besides keeping the inside inside, and the outside outside.

Heat transfer, both warming and cooling, sunlight protection, sweating, and it contains lubricants to keep this membrane flexible. You'll easily be able to think of other skin-associated functions.