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a collection of tissues joined in a structural unit to serve a common function.
rhythmical wave-like muscular contractions of a duct in order to cause movement of substances...
animals that live socially or in colonies and perform certain tasks for the good of the colony...
waste water from sinks, washing machines, dishwashers, showers and baths, which can be used for...
tissues that are responsible for the transport of substances within the plant.
two species that interact symbiotically in a relationship that is beneficial to both species....