Protists Helping: phytoplankton in ocean produce most of world's oxygen, phytoplankton are the basis for the food chain in the ocean, algae are used in food, carrageenan is a food thickener made from kelp, agar is a food thickener made from the cell walls of red algae, algae can make biofuel, diatoms are used in toothpast, silver polish, filters, paint, slime molds decompose dead organic matter, Protists Harming: parasitic water molds cause disease in crops, some dinoflagellates cause red tides, red tides are large concentrations of algae that release toxins in water, some are pathogens, Giardia lamblia causes diarrhea, Plasmodium vivax causes malaria, Trypanosoma brucei causes Africa sleeping sickness, Naegleria fowleri is a brain-eating amoeba that almost always causes death, Fungi Helping: many mushrooms are edible, yeast is used to make bread, yeast can make recombinant proteins, penicillium roqueforti makes blue cheese, Penicillium camemberti makes the rind on brie, soy sauce is made from fermented paste that includes mold, Penicillium chrysogenum is used to make the antibiotic penicillin, mushrooms decompose dead organic matter, mushrooms can be used to make a leather-like material, Fungi Harming: Many mushrooms are poisonous, Molds can ruin food, Corn smut causes disease in corn crops, Some sac ones cause diseases in trees, Athlete's foot is caused by one, some household molds cause illness,

Helpful vs. Harmful

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