At which level of the food pyramid is the smallest percentage of total stored energy found?

Apoptosis is the term for programmed cell death. This can occur for a variety of reasons, usually due to irreparable organelle damage, such as from DNA mutagens, microbe infection, or metabolic waste buildup. Lysosomes begin to empty their hydrolytic wastes and self-digest the cell's contents upon apoptosis in a process called autophagy, or literally "self eating."