Simple tissues differ from complex tissues primarily in their cell composition and function. Simple tissues consist of only one type of cell that is usually similar in structure and perform uniform functions such as storage, repair, secretion, or mechanical support. Examples include parenchyma, collenchyma, and sclerenchyma. In contrast, complex tissues comprise more than one type of cell, which work together to perform specialized functions such as transportation of water, minerals, and food. Examples of complex tissues include xylem and phloem. Simple tissues are generally found throughout the plant, while complex tissues are located in the vascular regions for transport purposes.