Are Gametes Unicellular or Multicellular?

Most multicellular organisms have a unicellular life-cycle stage. Gametes, for example, are reproductive unicells for multicellular organisms. Additionally, multicellularity appears to have evolved independently many times in the history of life. Some organisms are partially unicellular, like Dictyostelium discoideum.

Is sperm unicellular or multicellular?

Yes, it's certainly as alive as any other cells in a male body. Since it can have a life of its own outside the body, each sperm is really an independent single-celled organism – like a living amoeba, but differing in locomotion and lifestyle.

Which cells are unicellular or multicellular?

While prokaryotes are always unicellular organisms, eukaryotes can be either unicellular or multicellular. For example, most protists are single-celled eukaryotes!