There is energy in substances such as carbohydrates and fat. The energy in these molecules is actually due to:
a. the energy released when carbon atoms are completely burned up.
b. the energy released when bonds holding the atoms together are broken and reformed.
c. the energy released when protons and neutrons are fused.
d. the energy released when protons and neutrons are split.
Answer: b. the energy released when bonds holding the atoms together are broken and reformed.
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