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1. Because there are too many organisms in the Protist Kingdom.

2. Some organisms are way different compared to each other.

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8y ago
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11y ago

There are 2 main reasons why scientists believe that the Protist Kingdom should be broken up.

One reason is that there are just way too many organisms in the kingdom. The second reason is that some organisms are just too different compared to one another

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13y ago

Protists are mostly the misfits that don't belong elsewhere. Thus, their characteristics and properties are somewhat nebulous and they don't form a cohesive group. It would be better for classification purposes to further divide the group.

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10y ago

Because Protista is a large and very diverse group of organisms and there is no one characteristic that they all share (besides being eukaryotes). They are often too different in a number of ways, so it's hard to classify them all into one single group.

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Q: Why do scientist believe protists should be broken up into several kingdoms?
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Continue Learning about General Science

Is eukarya greater than or less than animalia?

Animalia. (Eukarya includes Protists, Animalia, Plantae, and Fungi)


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They help us directly divide kingdoms into several groups.


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The scientific theory should be changed.


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Protists belong to what kingdom?

Originally, the "protists" were either classified as "animal-like"/"protozoon" or "plant-like"/"algae", back when the only two kingdoms were Linnaeus' Regnum Animalia and Regnum Vegetablia. A lot of protists, though, did not really fit into either of these categories, including (for instance) the green euglena Euglena viridis. Like an animal, the green euglena is able to move freely (with its flagellum), eat other creatures, and detect light. Like a plant, though, the euglena typically photosynthesises (reverting to heterotrophy when dark), and has a cell wall (albeit a flexible one). Ernst Haeckel thus created a new kingdom, Protista, to include such "misfits". Over time, the two-kingdom system fell into disfavour and was replaced by the five kingdoms Monera, Protista, Plantae, Fungi, Animalia.Recently, though, improved genetic techniques revised taxonomy again. The current trend is to base taxonomic groups on evolutionary relationships. As Protista was created as a wastebasket taxon, and its members were so incredibly diverse, it has since been split into several kingdoms, including Amoebozoa (amoebae and most slime moulds), Choanozoa (single-celled immediate relatives of the animals), Chromalvelota (ciliates, apicomplexans, brown algae, diatoms, etc.), Excavata (euglenae, deer fever, etc.), Rhizaria (radiolarans, forimaferians, etc.), and various others. We're still very far from a true consensus, so many just still use "Protista".