Respuesta :

Explanation:

a) Tracheids,Vessels,Xylem Parenchyma, Xylem Fibres

b) Sieve tubes, Companion Cells, Phloem Parenchyma , Phloem Fibres

Answer:

Xylem is composed of 4 elements: tracheids, vessels, xylem parenchyma and xylem fibres

Explanation:

The four elements of the phloem are as follows:

Sieve tube elements: They are long tube-like structures arranged longitudinally. ...

Companion Cells: Companion cells are specialised parenchymatous cells. ...

Phloem Parenchyma: ...

Phloem Fibres: