He observed a single cell on the slide. It was round with a nucleus in the middle of the cell and a structure that the cell could use to move He concluded it was an animal cell. James said it was a unicellular protist. Who is correct and which piece of evidence supports the correct claim

Based on the evidence provided, James is correct. The presence of a nucleus and a structure that allows the cell to move are characteristics of a unicellular protist. Animal cells also have a nucleus, but they do not possess a structure for movement, such as a flagellum or cilia.