A diagram in the course handout shows that older practical classification of protozoans separates amoeboids, flagellates, ciliates, and sporozoans. Identify the related structure or process.

Traditional protozoan classification often used locomotory structures such as pseudopodia, flagella, and cilia. Although modern classification relies more on phylogeny, these features remain useful in practical identification. This MCQ belongs to the Protozoan taxonomy topic in Animal Diversity-I and is written to test concept understanding rather than memorized wording.