[Solved] Cleavage A) is completed in the first two hours following fertilization B) increases the number of cells of the embryo C) increases the size of the embryo D) all of these choices Microscope: An instrument used to see objects that are too small to be seen by the naked eye, enhancing the resolution and visual perception of the observer. Oculars: Refers to the eyepieces on microscopes or other optical instruments, aiding in magnification and observation. Physician's Office Laboratory: A small lab located within a physician's office where various tests are performed on-site to aid in the quick diagnosis and treatment of patients. Turnaround Time: The amount of time taken to complete a process, task, or fulfill an order from start to finish.