The kingdom Protists is the only kingdom that contains both autotrophs and heterotrophs and unicellular and multicellular organisms. Bacteria and archaea are prokaryotes, while all the plants, fungi and animals are eukaryotes in this phylum. They contain amoeba as unicellular and heterotrophic organism and algae as autotrophs. They also contains unicellular organisms such as euglenophytes and multicellular organism such as seaweed and kelp.