Let me share with you a difference between protozoa and metazoa
| Aspect | Protozoa | Metazoa |
| Cellular organization | Unicellular | Multicellular |
| Cell Type | Eukaryotic | Eukaryotic |
| Mode of nutrition | Heterotrophic | Heterotrophic |
| Mode of locomotion | Various modes, including flagella, cilia and pseudopodia | Varied, including walking, crawling, swimming, and flying |
| Type of reproduction | · Asexual e.g. binary fission and budding · Sexual e.g. conjugation and syngamy | · Sexual and asexual reproduction |
| Symmetry | Typically asymmetrical or spherical | Radial or bilateral symmetry |
| Tissues | Lack true tissues | Have specialized tissues and organs |
| Developmental Stages | Generally lack distinct developmental stages | Distinct life cycle stages, including embryonic development |
| Habitat | Found in diverse environments, including water, soil, and as parasites | Occupy various habitats, including terrestrial, aquatic, and aerial |
| Sensory Organs | Basic sensory structures | Specialized sensory organs |
| Size Range | Typically microscopic, but some are macroscopic | Microscopic to macroscopic, depending on the species |
| Behavior | Limited behavioral complexity | Complex |
| Examples
| · Amoeba · Paramecium · Euglena
| · Insects · Mammals · Fish · Birds · Humans |