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rhythmical wave-like muscular contractions of a duct in order to cause movement of substances within it.
the factor in an investigation that is under the control of the investigator.
the tube through which urine passes from the bladder to the exterior.
a kingdom of plant-like unicellular and multicellular organisms that do not contain chlorophyll...
refers to any variation in the nucleotides, genes, chromosomes, or whole genomes of organisms....
large blind-ending sac forming the first part of the mammalian large intestine, to which the...