The correct answer is Only a, b, and c. CONCEPT: Amoeboid protozoans: • These organisms live in freshwater, seawater, or moist soil. • They move and capture their prey by putting out pseudopodia (false feet) as in Amoeba. • Marine forms have silica shells on their surface. Some of them such as Entamoeba are parasites. • Flagellated protozoans: • The members of this group are either free-living or parasitic. • They have flagella. The parasitic forms cause diseases such as sleeping sickness. Example: Trypanosoma. EXPLANATION: • Amoeba is a cellular animal without tissues and organs. • Amoeba is the simplest and most primitive of all animals. • Amoeba has pseudopodia which is used for locomotion and for capturing food particles. • Amoeba is not a pore-bearing animal. Instead, sponges are pore-bearing organisms.