Answers

2016-01-19T20:09:09+05:30
It is because they are made up of more than one type of cell which performs various function of xylem and phloem
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2016-01-19T20:44:25+05:30
Xylem and phloem are known as complex tissues because they consist several kinds of cells but all of them function together as a single unit

hope it helps...
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