LIFE SCIENCE

Detailed explanation-1: -Amoeba is a unicellular organism and the single cell performs all functions of a living organism because cell is the fundamental unit of living organism.

Detailed explanation-2: -All the life processes in a unicellular organism, including digestion, excretion, respiration, occur within a single cell. These cannot be seen by naked eyes and are hence called microorganisms.

Detailed explanation-3: -Some things consist of only one cell. They are called unicellular organisms. One of the simplest living things, an amoeba, is made of only one cell. Amoebas (sometimes spelled amebas or amoebae) are too small to be seen without a microscope, but they are commonly found in ponds and lakes.