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.
Vascular tissue Vascular tissue is a complex conducting tissue, formed of more than one cell type, found in vascular plants. The primary components of vascular tissue are the â¦ xylem and phloem. These two tissues transport fluid and nutrients internally. Vascular tissue is used to transport nutrients from the base of the plant to throughout the organism.     That's the gist of it.     Here's how it works:  â¦    First off, plants don't move like animals. For example, humans can pick up their nutrients (food/water, etc.) with their hands.