Question

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Why complex tissues are made up from different types of cells ?

Answer 1

these tissues are made up of more than one type of cell.the cells of simple tissue perform similar function.
the cell of many complex tissue may perform different function.example of complex tissues are xylem and phleom

Answer 2

because different types of cells perform different functions cells more or it may be less perform similar functions.And  example of complex tissues are pholem and xylem tissues. in xylem tissues tracheids help in transport of water. parenchyma store food. thats all             hope it helps....