[Solved] Discuss Klein's concept of the paranoid-schizoid position. Microscopic Composition: The arrangement and structure of cells and tissues as seen under a microscope, revealing details not observable to the naked eye. Tissues: Collections of similar cells and their extracellular matrix from the same origin that carry out a specific function. Atypical Nevus: A mole that appears unusual or different from common moles, sometimes posing a higher risk of melanoma. Trunk: The main part of the human body that extends from the neck to the abdomen, excluding the head, arms, and legs.