Linked from
The 9 pages that link to Programmed cell death, each with the reason it gives.
MulticellularityRelated: Removing damaged or surplus cells helps preserve organism-wide function.
TracheidRelated: Mature tracheids lose their living contents before functioning as conduits.
Rita Levi-MontalciniRelated: Nerve growth factor helps prevent this process in responsive neurons.
Growth processesRelated: Removing selected cells can shape structures during growth.