Acertain cell cannot get the amount of oxygen and nutrients that it needs into the cell. it is possible that the surface-area-to-volume ratio is
1) not changing quickly enough
2) too high
3) changing to quickly
4) too low

chemical because it warmed up which involves temperature and it bubbled which includes changing

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if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.