1 Protozoa: They are unicellular. They are aquatic. They take in food. Algae: They can be multicellular or unicellular. They are aquatic. They make their own food. Protoctists Protoctists include protozoa and algae. Bacteria Bacteria are unicellular. They are the smallest and simplest of all living things. Most bacteria take in food. 1 1 ●○○ NAME the kingdom these living things belong to. They are multicellular. They take in food and can move about. They are multicellular. They take in food, but cannot move about. They are unicellular and aquatic. They take in food. They are unicellular. They have a small and very simple cell. CoMPARE Why do you think fewer species of bacteria are known than the other groups of living things? B e a Sc i e nt i s t ! protozoa algae TH I N K AB0UT IT ! Scientists study living things. Why is it important to study the living things that we find in our daily lives? Approximate number of known species of living things 1,600,000 1,200,000 1,000,000 800,000 600,000 400,000 200,000 0 1,430,000 310,000 97,000 67,000 11,000 bacteria 1,400,000 animals plants fungi protoctists s e v e n t e e n · 17
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