Is an indicator of programmed cell death.

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."

Competition. interaction among organisms that compete for the same natural resource (food, shelter, water, space) in an ecosystem. predation. an interaction in which one organism kills another for food. predator. prey. symbiosis. mutualisum. commensalisum. parasitisum.

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