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| profound change in form from one stage to the next in the life of an organism, as from the caterpillar to the pupa and then to the adult butterfly |
| the series of living phenomena exhibited by an organism in the course of its development from inception to death |
phototaxis pho·to·tax·is (fō'tō-tāk'sĭs)
n.
The movement of an organism or a cell toward or away from a source of light.