The type of transport that does not require energy is transport relying on natural forces or human/mechanical effort without fuel or electricity. Examples include:
- Sailboats that use wind power only, requiring no fuel energy for propulsion, just manual energy for steering and adjusting sails.
- Walking and cycling, which rely on human muscle power and do not consume external energy.
- Passive transport in biological systems, such as diffusion, which moves substances without energy input.
Thus, transport by walking, cycling, and sailboats using wind power are types that do not require external energy sources like fuel or electricity for movement.
