Protozoa

♤ 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.