Give scientific reasons: Vascular tissues are also called complex tissues.

(N/A) $\Rightarrow$ Vascular tissues are composed of more than one type of cell that work together as a unit to perform a common function. Because they consist of diverse cell types,they are termed complex tissues.
$\Rightarrow$ Xylem tissue is composed of tracheids,vessels,xylem parenchyma,and xylem sclerenchyma (fibres).
$\Rightarrow$ Phloem tissue is composed of sieve tube elements,companion cells,phloem parenchyma,and phloem sclerenchyma (fibres).
$\Rightarrow$ Since these tissues are made up of different types of cells working in coordination,they are classified as complex tissues.