The trait of the organism is unicellular, no nucleus contains DNA. The domain that the organism most likely belong is bacteria. The correct option is A.
What are unicellular organisms?
Unicellular organisms are those that are made up of a single cell. These organisms are very small and only be seen through a microscope. The cell contains no original cell organelle and a nucleus.
Bacteria are considered the primitive and smallest living organism. They are single-celled, and these cells also contain flagella or cilia for locomotion and finding food.
Animalia, eukarya and protists are not only unicellular, but some are multicellular and these organisms contain a nucleus that has DNA.
Thus, the correct option is A. Bacteria.
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