A shifter is a lever, a lever is a simple machine
I'd say the gears on a bike acts as levers, as pedals and driven wheel turns with different speeds and force.
Wheel and axle.
A sprocket is a lever.
To do bicycling you need a bicycle. And the bicycle is a man-made item relying heavily on techology to provide all the bits and pieces.
Eliptical Machine
Mostly it is bilaterally symmetrical The pedals have an inverse mirror symmetry. The chain and gears are asymmetrical.
A pulley isn't a kind of simple machine, it is a simple machine
The type of simple machine that a slope is, is a inclined plane
it is a valve, which is not a simple machine.
a simple machine.
a phone isn't a simple machine stupid
A sink isn't any type of simple machine. It's just a container.