What are some positives and negatives about protists?  

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The Protista kingdom is extremely diverse. All the members are eukaryotic organisms (they have membrane bound organelles), but some are unicellular while others are multicellular. Some are photosynthetic, and some are not. Some are free-living in water or soil, while others live inside of other organisms.

The major negative about...

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The Protista kingdom is extremely diverse. All the members are eukaryotic organisms (they have membrane bound organelles), but some are unicellular while others are multicellular. Some are photosynthetic, and some are not. Some are free-living in water or soil, while others live inside of other organisms.

The major negative about protists is that some cause diseases, both in humans and in other organisms. Examples are amoebic dysentery, meningo-encephalitis, malaria, toxoplasmosis, and African sleeping sickness. Some of these are transmitted by drinking contaminated water, while others go through an insect vector and are transmitted via insect bite. The second link I have attached has more in-depth information.

There are many positives about various protists. Plankton, mostly classified as protists, are at the base of many food chains in the ocean. Kelp (seaweed) is used as food by humans. Photosynthetic types of protists that live in the oceans produce quite a bit of the earth's free oxygen--perhaps as much as half. Some protists are decomposers, recycling dead organisms.

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