Protozoans are classified by the way they move. Some have Cilia or Flagella, but the amoeba has an unusual way of moving by stretching it's cytoplasm into finger-like extensions called pseudopodia.
According to new system of classification as given by Whittaker 1969 unicellular animals are included in a seprated kingdom known as protista and or known as protozoans i.e. single cell. The animal...