What is the disadvantage of the unicellular state of protists?

One disadvantage of the unicellular state of protists is that they may be more vulnerable to predation and environmental changes compared to multicellular organisms. Being single-celled means they have limited protection and resources, making them more susceptible to being consumed by predators or affected by changes in their surroundings. Additionally, unicellular protists may have limited abilities to carry out complex functions or behaviors that multicellular organisms can perform, which can limit their overall survival and reproductive success.