Answer the following question given this paragraph: 

After citric acid forms, it goes through a series of reactions that release energy. The energy is captured in molecules of NADH, ATP, and FADH 2 , another energy-carrying compound. Carbon dioxide is also released as a waste product of these reactions.


Q: After citric acid forms, it goes through a series of reactions that release what, which is then captured in special molecules?


A:
energy