Final answer:
The US House of Representatives plays a role similar to a prosecutor in impeachments.
Step-by-step explanation:
The role that the US House of Representatives plays in impeachments can be best compared to that of a prosecutor in a trial. The House acts as the charging body, bringing articles of impeachment against a government official. It has the sole power of impeachment, meaning it has the authority to accuse an official of wrongdoing. The Senate, on the other hand, acts as the jury, conducting the trial and ultimately deciding whether to remove the official from office.