De rups verandert in een vlinder. (The caterpillar changes into a butterfly.)
veranderen takes "in" (veranderen in = to change into). Example: De rups verandert in een vlinder. (The caterpillar changes into a butterfly.)
De rups verandert in een vlinder. — The caterpillar changes into a butterfly. The preposition in is fixed, so it doesn't change with the sentence.
Fixed prepositions come up all over the A2 exam. The platform drills them in real exam tasks, AI-graded across all five DUO sections.