[Solved] Income is an example of a _____, and the money in my bank account is a _____. A) stock; flow B) stock; stock C) flow; stock D) flow; flow Air Space: The portion of the respiratory system where gas exchange occurs; can also refer to the cavity within the alveoli in the lungs. Focus Controls: Features or devices on imaging equipment, such as cameras or microscopes, allowing the operator to adjust the clarity and sharpness of the image. 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.