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When using systematic random sampling,the sampling error will be zero.
Flukes
Parasitic flatworms that infect the liver, lungs, and other organs of their hosts, with life cycles involving one or more intermediate hosts.
Oral Sucker
A muscular structure found in some animals, such as parasitic worms, used for attachment to or ingestion of food from hosts or surfaces.
Alimentary Canal
A series of hollow organs joined in a long, twisting tube from the mouth to the anus, through which food is digested and nutrients are absorbed.
Molluscs
Invertebrates including squids, clams, snails, and chitons; characterized by a visceral mass, a mantle, and a foot.
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