A student examines a blood smear from a patient infected with the unicellular parasite Trypanosoma.

Which of the following statements provides valid evidence that Trypanosoma is a eukaryote rather than a prokaryote?

1. The cellular length is approximately $20\mu m$, which is comparable to eukaryotic host cells.
2. A distinct, membrane-enclosed nucleus is observed within the cell.
3. The cell possesses a flagellum for locomotion.