Which of the following organisms is one-celled and free-living?
Answer Details
The one-celled and free-living organism is Chlamydomonas. Chlamydomonas is a unicellular green alga that lives in freshwater environments. It has a simple structure with a single nucleus and chloroplasts for photosynthesis. It uses its flagella to move around and can reproduce asexually by cell division. Unlike Hydra, which is a multicellular animal, Chlamydomonas is a single cell that can live and function independently without the need for other cells.