Nelson-Denny Practice Test

The term that means to change or make changes to something is "alter." This word conveys the idea of modifying or adjusting an object, idea, or situation in some way. It can involve minor adjustments or significant transformations, depending on the context. The other terms have distinct meanings related to specific contexts. "Diverse" refers to a variety or difference among items or groups, suggesting a presence of multiple elements rather than a change to something. "Contaminate" specifically involves making something impure or harmful, typically through the introduction of a substance that negatively affects quality. "Congregate," on the other hand, pertains to gathering or assembling in a group, which does not imply any change or modification to the items or people involved. Thus, "alter" is the most fitting term for the act of changing something.