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What is complex tissue? Name the various kinds of complex tissues.
 
Complex permanent tissue is defined as a group of  cells performing a common function.
 
A complex permanent tissue made up of  types of cells having a  origin. Even though the cells' appearance is different, but all working as a unit to perform a particular function.
Complex permanent tissues are of   types, i.e., . They are also called , mainly made up of  , but  cells are not present in complex permanent tissues.