Answer:
Kingdom Protista
Step-by-step explanation:
Following up to the classification of living things into two broad classification; kingdom animalia and plantae by Carl Linnaeus in the 1700s, in the 1960s, German scientist, Ernst Haeckel proposed a three kingdom classification system which is, Kingdom Animalia, Plantae and Protista. Kingdom protista is to include all unicellular organisms such as fungi, protozoa, bacteria and other microorganisms.