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An Amoeba is characterized as a type of Protozoan that has no permanent shape, which aligns perfectly with the answer provided. This characteristic is due to its unique form of movement, known as amoeboid movement, where it extends its body (pseudopodia) in various directions, allowing it to change its shape fluidly in response to its environment. This adaptation enables the Amoeba to navigate through different substrates, engulf food, and move toward stimuli. The lack of a defined shape is fundamental to its identity as a member of the Protozoa group, which encompasses organisms that are primarily single-celled and can display a variety of shapes and sizes depending on their individual species and environmental conditions.

The other choices do not relate to the defining traits of an Amoeba. While they reference concepts relevant in other scientific fields, they do not pertain specifically to the biological classification or characteristics of an Amoeba.