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
It has many parts that work together to preform a function. Just like other comples machinesIt's got wheels, axles, levers and gear ratios.Because it consists of many simple machines.A bicycle is built up of several simple machines, (the lever, wheel and axle etc), and several simple machines interacting becomes a compound machine.