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Protists
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All eukaryotes that are not green plants, fungi, or animals
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Paraphyletic group
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Respresents some, but not all of the descendants of a single common ancestor
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Taxonomy
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The branch of biology devoted to describing and naming new species and classifying groups of species
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Toxoplasma
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Cause eye and brain damage in infants and in AIDS patients
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Giardia
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Cause diarrhea due to giardiasis (beaver fever) that can last for several weeks
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Trichomonas
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Causes reproductive tract infection which can cause infertility in females
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Leishmania
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Causes skin sores or affect internal organs such as the spleen and liver
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Trypanosoma gambiense and T. rhodesiense
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Cause "African sleeping sickness": potentially fatal disease transmitted through bites from tsetse flies
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Trypanosoma cruzi
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Causes Chagas disease which causes 50,000 deaths annually, mainly in South and Central America
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Entamoeba histolytica
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Severe infections results in amoebic dysentery
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Phytophthora infestans
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Wiped out potato crops in Ireland in 1845-1847
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Primary producers
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Produce chemical energy (through photosythesis)
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Plankton
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Small organisms that live near the surface of oceans or lakes and drift along or swim short distances
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Food chain
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Describes nutritional relationships among organisms
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Global carbon cycle
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The movement of carbon atoms fron carbon dioxide molecules in the atmosphere to organisms in the soil or the ocean and then back to the atmosphere
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