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!~

My pigs teeth have already came in years ago, with my first molars, and my second molars are pretty much in. my wisdom teeth will be unable to come in, but i'm getting those out on monday.