Question

The bicycle is said to be the most energy-efficient means of transportation. Where does the energy that drives it come from?

Answer 1

well the food that the person eats powers the mucles and the person uses their wieght/gravity to push down on the pedals which pulls the chain and, since the wheel is a diffarent size, you either get more power and less speed or more speed and less power

Answer 2

The energy that drives the bicycle comes
from the food that the rider eats.