What would the pendulum need chemical energy? ?

It contains cartilage, mucous membrane, bone, blood vessels, and a sensory organ called the olfactory bulb. So your nose is definitively an organ. An organ system is a bunch of organs, like your heart, liver, lungs, etc. working together to perform a specific task. So your respiratory system contains your nose, trachea, and lungs, all different organs working for the same cause.
you can also see isn't correct,I'm just not sure!~