Why are xylem and phloem called complex tissues? How are they different from one other?

Why are xylem and phloem called complex tissues? How are they different from one another ?

Why are xylem and pholem called complex tissues?

Why are xylem and phloem called complex tissues? How are they different from each other?

Why are xylem and phleom called complex tissue?

Why xylem and phloem are called complex tissues?

Why xylem and phloem are called as complex tissue

Phloem is a complex tissue.

Why are xylem and phloem called complex permanent tissue ? What are their chief constituents ? Also, mention their role.

Xylem and phloem are examples of ___ tissue.