Cheap bikes are made with cheap parts. Plastic pedals are cheap to make. Better pedals are made out of metal. (Worth noting: better bicycles don't come with pedals at all. This way the rider can get the pedal system that works for the rider.)
No, the pedals on this bicycle are not reverse threaded.
When choosing replacement bicycle pedals, important factors to consider include the type of riding you do (road, mountain, etc.), the material of the pedals (aluminum, plastic, etc.), the size and shape of the pedals for comfort and grip, and the compatibility with your bike's crankset.
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.
Because metal is durable and leightweight
To unscrew pedals from a bicycle, you need to turn them counterclockwise.
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.
plastic
The recommended allen key size for adjusting the pedals on a bicycle is typically 6mm.
Pedals on a bicycle are attached to the crank arms and are used to transfer the rider's energy into forward motion. When the rider pushes down on the pedals, the crank arms rotate, which turns the chain and ultimately drives the rear wheel. Pedals allow the rider to propel the bicycle forward by applying force with their feet in a circular motion.