respiration
Fusion releases more energy than fission.
fermentation
No, solidifying releases energy.
glycolysis
fermentation
Digestion.
oxidation
Nuclear fusion
Yes, if a process is exergonic, it releases energy and is spontaneous.
The process that releases energy to convert substances to simpler products is called catabolism. During catabolism, complex molecules are broken down into simpler molecules, releasing energy in the process which can be used by the cell for various metabolic functions.
Cellular respiration
resipiration