Description : The biggest single-celled organism is – (1) Yeast (2) Acetabularia (3) Acetobacter (4) Amoeba
Last Answer : (4) Amoeba Explanation: Researchers, in October 2011, found "giant amoebas" (Xenophyophores) beneath the surface of the Pacific in the Mariana Trench. At more than four inches in length, they are the largest single-celled organism on Earth. They are found exclusively in the deep sea.