Plants are either vascular or non-vascular . Vascular plants have tube-like structures that transport water from the roots to the stem to the leaves. Non-vascular plants absorb water only through their surfaces. The Great Plant Escape Vascular Vegetables Use common vegetables to observe the vascular structure and nature of plants. Another way to consider plant classification is according to reproduction .
Some plants reproduce by producing seeds .
Others produce spores . Plant Science Plant Galls To begin to classify animals, consider the backbone . Animals that have a backbone are called vertebrates . Animals that do not have a backbone are called invertebrates . All invertebrates lack backbones, but their other physical characteristics are quite varied.