A unicellular organism is found within a fish’s body. It is rod-like in shape, measures $700\,\mu\text{m}$ in length, is surrounded by a cell wall and contains cytoplasm with thousands of copies of small, circular DNA. Which statement about this unicellular organism is correct?
- AIt is a eukaryote, because it can be seen without using a microscope.
- BIt is a eukaryote, because it is too large to be a prokaryote.
- CIt is a plant, because it is enclosed in a cell wall.
- DIt is a prokaryote, because it has small, circular DNA in its cytoplasm.