Which of the following is a characteristic of simple tissues?

Simple tissues are defined by their composition, which consists of only one type of cell. This homogeneity allows simple tissues to perform specific functions more efficiently, as all cells within the tissue work together to fulfill the same role. For instance, parenchyma, collenchyma, and sclerenchyma are examples of simple tissues that each consist of only one type of cell which contributes to functions such as storage, support, and protection.

The other options involve characteristics that do not fit the definition of simple tissues. For instance, multiple cell types are characteristic of complex tissues, such as xylem and phloem, which contain various specialized cells working together. Complex vascular tissues specifically include a mix of different cell types to perform diverse functions related to transport and support in plants. The presence of both living and dead cells is also more relevant to certain complex tissues; simple tissues, particularly parenchyma, can be composed only of living cells, while sclerenchyma may involve dead cells. This distinct nature of the cell composition is essential for understanding plant anatomy and physiology.