1
The majority of machines that we use in our lives are complex.
2
It is a lever that makes the bike change direction.
3
They are of a bike turn on an axle. They allow the bicycle to move.
4
They are a set of levers that are joined to the handlebar.
5
They are levers that use human force to move a cyclic gear.
6
As the pedals move, so do the gear, the ..... and the wheel.
