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♤ Protozoa are simple, single-celled animals.
♤ They are the smallest of all animals.
♤ Most protozoa are microscopic.
♤ They do breathe, move and reproduce like multicelled animals.
♤ E.g: amoebas, Flagellates,etc.
Arthropods
♤ Arthropods have limbs with joints that allow them to move.
♤ They also have an exoskeleton, which is a hard, external skeleton.
♤ Arthropods include the crustaceans and insects, arachnids.