Ключевые слова: annual ring, background, bark, biology, botanic, botany, cambium, cell, collenchyma, cork cambium, cortex, crosssection, cutin, detail, dicot, education, epidermis, ground tissue, isolated, lab, macro, meristem, microscope, microscopic, monocot, nature, parenchyma, pattern, phloem, pith, plant, plant stem, research, science, sclerenchyma, secondary growth, secondary phloem, secondary xylem, section, slide, stele, stem, under, vascular, vascular bundle, vascular cambium, vascular plant, white, wood, xylem,