This subsystem is specialized for contraction. The structure of protein fibers inside allows it to stretch and contract.

Themes; subfields is the answer

Ibelieve the answer is c. map projections.hope my answer has you : )

It is useful for historians to write narratives so that history can be passed on from their point of view.  think about a story being told in third person, then think about it again being told in first person, by someone who actually experienced the event.