Schistosomiasis, a disease caused by a parasitic worm, is prevalent in hot, humid climates, and it has become more widespread as irrigation projects have enlarged the habitat of the freshwater snails that are the parasite's hosts for part of its life cycle.
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Athe freshwater snails that are the parasite's hosts for part of its life cycle
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Bthe freshwater snails that are the parasite's hosts in part of their life cycle
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Cfreshwater snails which become the parasite's hosts for part of its life cycles
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Dfreshwater snails which become the hosts of the parasite during the parasite's life cycles
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Eparasite's hosts, freshwater snails which become their hosts during their life cycles
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