[Solved] Which of the following has the highest share of online retail sales? A) omni-channel merchants B) virtual merchants C) catalog merchants D) manufacturer-direct Physician's Office Laboratory: A lab located within a doctor's office where various diagnostic tests can be performed on-site for convenience. Chemistry And Hematology: Branches of medical science; chemistry focuses on the chemical composition and processes in the body, while hematology studies the blood and its disorders. Routine Tests: Standard medical tests performed during a physical examination or check-up to monitor and maintain overall health and detect any possible diseases or conditions early. Optical Microscope: A type of microscope that uses visible light and a system of lenses to magnify objects, allowing for the observation of small details not visible to the naked eye.