Question 29 (2 points) Which statement is true regarding the metabolic machinery of humans and animals? O All food first must be converted into glucose before it is usable. O Humans and animals can extract energy from sugars, lipids, and proteins. O All food first must be converted into a carbon compound and an amino group before it is usable. O All food first must be converted into glycerol and glucose before it is usable. O Simple sugars are the only real valuable energy source for humans and animals.. 20 DII DD F3 F4 F5 F6 F7 F8 F9 $ % & 4 O - 5 6 8 9 E R T Y U O D F G H C K r C V B N