What does it mean to metamorphose?

To metamorphose means to undergo a significant change in form, structure, or appearance. This process is often associated with dramatic transformations—like a caterpillar changing into a butterfly. The essence of the term is rooted in the idea of a complete change, particularly in outward characteristics, which aligns perfectly with the choice indicating a change in outward structure or looks. This definition captures the transformative nature of metamorphosis, emphasizing that it involves an alteration that is often visually perceptible and profound. Other options suggest static or less transformative actions, which do not align with the fundamental concept of metamorphosis.