During the 7th century the power of the Eastern Roman (Byzantine) Empire was challenged by the Sassanids of Persia, who invaded Egypt in 616. They were expelled again in 628, but soon after, in 642, the country fell to the Arabs, who brought with them a new religion, Islam, and began a new chapter of Egyptian history.
the bark protcts the zylem and the phloem fron infection.bark is like our skin and if we cut off some of it and didnt keep it clean it would become infected.you could shave off a couple of inches and a tree may live depending on its age but if its a sapling and about 3 to 5 inches in diameter it would die eventually.
The bark of a tree is a mixture of old, nonfunctional phloem and the young functional phloem (periderm). Xylem: There are two types of conducting cells in xylem, tracheids and vessel elements. Both have thick lignified secondary walls and are dead at maturity.round tissue has a wide variety of functions, even though it is composed of fairly simple tissue types. Parenchyma Tissue: The most abundant, diverse, and versatile cells in a plant are found in the parenchyma tissue.