No , most protists are unicellilar , some are colonial.
Kingdom: Protista They are eukaryotic
The kingdom of protists has both heterotrophs, autotrophs, and uni/multicellular organisms.
Animalia contains only multicellular organisms.
Animalia is the kingdom that consists only of complex multicellular eukaryotic organisms.
Fungi And Protists
plantea
Kingdom Plantae
Kingdon Fungi and Kingdom Plantae include multicellular organisms as well as Kindgom Anamilia; all eukaryotes.
The organisms found in the kingdom Animalia are multicellular, heterotrophic organisms that lack cell walls. They exhibit diverse characteristics and behaviors, ranging from simple sponges to complex mammals.
kingdom plantae is multicellular and classifies photosynthetic
Plantae
The kingdom Monera consists of unicellular organisms.