[Solved] Explain some of the challenges in comparing election turnout rates across different countries. Polymer: A large molecule composed of repeating structural units, typically connected by covalent chemical bonds, found in many materials and biological systems. Vascular Plants: Plants that have specialized tissues (xylem and phloem) for transporting water, nutrients, and sugars throughout the organism. Angiosperms: The traditional name for flowering plants, a very large (more than 300,000 species), diverse phylum of plants that form flowers for sexual reproduction and produce seeds enclosed in fruits; include monocots and eudicots. Gymnosperms: Gymnosperms are a group of seed-producing plants that includes conifers, cycads, Ginkgo, and gnetophytes, distinguished from flowering plants by having naked seeds.