1, Chlamydomonas and paramecium belong to different biological classifications. Chlamydomonas is a kind of green algae, belonging to the plant kingdom. It has the ability of photosynthesis and can live an autotrophic life. Paramecium is a kind of protozoa, belonging to the phylum Protozoa, which cannot carry out photosynthesis and needs to ingest organic matter to maintain life.

2. Chlamydomonas and paramecium have obvious differences in morphological characteristics. Chlamydomonas is usually a unicellular or multicellular algae, which has a similar cell structure to plants, including cell walls and chloroplasts. Paramecium is a unicellular protozoa, which has a special flagella structure and can be moved by flagella movement.