An animal requires energy to move.
When an animal moves, it burns energy.
Burning energy is what allows for movement in animals.
What allows for movement in animals?
Options:
(a) the digestive system
(b) an external framework
(c) energizing crystals
(d) Veins and arteries.
(e) spinning wheels
(f) burning energy
(g) arteries
(h) changing tires