How are microscopic one celled animals classified?

Microscopic one-celled animals, known as protozoa, are classified primarily based on their modes of movement and feeding strategies. They are typically grouped into four major categories: amoeboids (which move using pseudopodia), flagellates (which use flagella), ciliates (which use cilia), and sporozoans (which are mostly non-motile and often parasitic). Classification can also consider factors like their life cycles, habitat, and genetic makeup. Overall, protozoa are part of the broader kingdom Protista, which encompasses various unicellular and simple multicellular organisms.