Bike parts are…
WALT: Analyse the importance of the parts
I think all the bicycle parts are important except the bell because you can shout MOVE! Without pedals you would get tired from pushing with your feet on the ground. Without the handlebars you could not steer the bike. Without reflectors you would be run over because the driver can't see you in the dark. The seat makes the ride a lot more comfortable and without it would be uncomfortable. Without the frame the bike wouldn't be a bike, It would just be small pieces scattered on the ground because the frame holds the bike together.