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Because they are parasitical. The plasmodium protists causes malaria by invading red blood cells for its nutrition.

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Q: Why are some protists harmful to living organisms?
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What are some organisms aside from plants and animals?

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Some of them are, however, there are many microscopic organisms that are not harmful, some of which you could not survive without.


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There are harmful to all organisms, but some bacteria are helpful in many ways.


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These protists share many characteristivd with Fungi. However, because of their differences from Fungi they are classified as protists. Funguslike protists play a valuable role in the ecosystem. They break down dead plant and animal matter, making the nutrients from these dead orgainsms available for living organisms. While some slime molds and water molds are benefical, many others can be very harmful. Many fuguslike protsts attack and consume living plants.


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How do protists and bacteria compare in size?

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