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In class systems,social categories are more clearly and rigidly defined than they are in caste systems.
Tapeworm
A parasitic flatworm that lives in the digestive tract of vertebrates as adults, often causing health issues such as weight loss or nutrient deficiencies.
Hookworm
A parasitic nematode that lives in the small intestine of its host, which can be humans, and causes anemia and malnutrition through blood loss.
Trichinosis
Infection caused by the roundworm Trichinella spiralis.
Nematocysts
Specialized cells in the tentacles of cnidarians such as jellyfish, used for capturing prey and defense through the release of toxins.
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