This requires energy, which can be converted from chemical energy stored in food to useful forms of energy, or can be converted from the energy in sunlight to stored forms of chemical energy and converted again into useful forms of energy.
(This; requires; energy, which can be converted from chemical energy stored in food to useful forms of energy, or can be converted from the energy in sunlight to stored forms of chemical energy and converted again into useful forms of energy) (energy; can be converted; from chemical energy) (chemical energy; stored; L:in food; to useful forms of energy)
This energy chemical energy
requires can be converted stored
energy, which can be converted from chemical energy stored in food to useful forms of energy, or can be converted from the energy in sunlight to stored forms of chemical energy and converted again into useful forms of energy
from chemical energy
L:in food to useful forms of energy