[Solved] Describe the essential features of the hierarchy of needs model. Chemical Solutions: Homogeneous mixtures comprised of two or more substances with solutes dissolved in solvents. Anatomy: The scientific study of the structure of living beings, including their systems, organs, and tissues. Microscope: An instrument used to view objects that are too small to be seen by the naked eye. Scalpel: A small and sharp instrument used in surgery and anatomy dissections for making precise cuts and incisions.