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An abundant energy source.
No it is a mode of passive transport or water.
the white blood cells
To get from my home to my place of work, my means (mode) of transport is by a bus ride. Though in summer, my mode of transport is by bicycle.
water transport
travel on the road
food You body can also produce adrenaline when you are in "fight or flight" mode. In that case Adrenaline would be your body's main energy source.
depends on the mode of transport and distance
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Yes
Mostly. Other common mode of transport was boats.
Walking is the oldest. Riding (or being pulled by) an animal is the second oldest. The oldest mode not requiring the energy of a living creature (other than to steer) is sailing.