👉 Hierology is a branch of biology that studies the structure and evolution of complex organisms, including plants, animals, and fungi. It involves the study of the physical characteristics of living organisms, such as their cell walls, cell membranes, and genetic material. The term "hierology" was coined by Carl Linnaeus in 1753 to describe the systematic classification of plant species based on their arrangement of cells and tissues within a single organ. This system has since been widely adopted