The threads on bicycle pedals are American Standard.
Motor cars and Bicycle's both have pedals.
bicycle
How fancy do you want them to be? Cheap pedals are die-cast. Expensive pedals are machined.
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.
Velocipede
That'd be the crank arm.
Two
A motorcycle has a motor and no pedals
Because metal is durable and leightweight
the amount of force spinning the pedals
Pedals and seats