Are a diverse collection of mostly single-celled eukaryotes, which are sorted into several kingdoms to reflect their evolutionary relationships

Many of the prokaryotes are known as archa ealive in harsh places and environments, such as salty lakes. ... protistsare are part of the diverse collection of single Plantae. The Protist Kingdom are mostly unicellular organisms that might have characteristics almost like plants, animals or fungi. Protists: mostly unicellular, few multicellular, eukaryotic, can be heterotrophic or autotrophic.