Scientists have divided the animals into two groups - the Protozoa and the Metazoa.
The Protozoa are the simplest members of the animal kingdom. They are very tiny unicellular or single-celled animals. Examples of such animals are the amoeba and the Paramecium.
The Metazoa consists of animals which are multi-celled. They have more than one cell and have symmetrical bodies. This group is further sub-divided into the Vertebrates and the Invertebrates.
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