The human skeleton can be divided in 2 parts: axial and appendicular skeleton. The axial skeleton is composed by the skull, spine and ribs. The appendicular skeleton refers to the limbs (both arms and legs).
Using the metaphor of the coat rack, the axial skeleton would be the central pole of the rack and the appendicular skeleton would be both the pieces where you hang the coats and the feet or base of the coat rack.
In the food chain, a producer absorbs energy from the sun and then uses photosynthesis to turn the sunlight into energy. Then, one of the consumers in the food chain will eat the producer and obtain the producers energy.
The answer would be the muscle fiber because it's the small part of the contracting unit.
