Final answer:
Protozoa are single-celled eukaryotic organisms that can move using different structures. They are diverse and can be found in various habitats. Some protozoa are harmful pathogens.
Step-by-step explanation:
Protozoa, or protozoans, are single-celled eukaryotic organisms that share some traits with animals. They can move by flagella, cilia, or pseudopodia, or they may not move at all.
Protozoa are very diverse and can be found in various habitats like freshwater, marine environments, and soil. They play important roles in food webs and can be harmful pathogens causing diseases like malaria and giardiasis.