Here are the answers to the questions: 1) The main types of plants are vascular and nonvascular. 2) Nonvascular plants lack tube-like cells and do not have true roots, stems, and leaves. 3) Moss is a small, simple nonvascular plant that has both stems and leaves but no roots. Main characteristics are fine soft stems, grow upright in mats, leaves are one or two cells thick and grow from all sides of the stem. 4) Mosses are considered nonvascular because their vascular (inner) tissue is very simple. 5) Moss species are classified by placement of leaves on the stem and shape of leaves. 6) The four uses of moss