Q.

The biggest single-celled organism is –

A. Yeast
B. Acetabularia
C. Acetobacter
D. Amoeba
Answer» D. 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.
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