Hey here is your answer bro
When the switch is on its an close circuit
in which all wires and the switch is connected to all the part without any gap so that the electricity can flow through all parts and switch and the results is the on fan or moving fan and blown bulb
when the switch is off it's an open circuit or you can say it broken circuit
in which there's a ga... morep in between of all wires and switch that's why the electricity can't flow through to all parts and the result is off fan and unblown bulb
Adaptation is an evolutionary process where a plant or an animal becomes suited to living in a particular habitat. These are changes that take place over many generations through natural selection. Changes may be physical or behavioural.