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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