Saprobes, which are fungus-like protists, are specialized in absorbing nutrients from non-living organic substances, such as dead creatures or their excrement. Many oomycetes, for example, grow on dead animals or algae.
Saprobic protists play an important role in restoring inorganic nutrients to the soil and water. Protists, bacteria, viruses, fungus, plants, and mammals are all examples of parasites. Parasites are thought to account for 40% of all animal species. Some parasites reside on their hosts (ectoparasites), while others live within them (endoparasites) (endoparasites). Parasitic protists create sickness that is both fatal and morbid. Plasmodium, Leishmania, Trypanosoma, and Toxoplasma are among the protists. Malaria, sleeping sickness, and Chagas disease are among the ailments they cause.
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