The answer should be large vehicles. One should not park next to large vehicles or vehicles that are too close to the white space markings. You should make sure their is enough space to get in and out easily.
Electricity is the manifestation of traveling currents. These currents however are unable to move unless one were to complete a "circuit" (Word you are looking for). If the circuit is not completed electricity doesn't travel.
I think they are
Protista
Fungi
Plantae
Animalia
Monera
Answer:
A. Negative feedback mechanism