[Solved] _____ attention refers to being acutely aware of only one thing at a time. A) Focused B) Overt C) Divided D) Covert Chemical: A substance that undergoes a chemical reaction, consisting of atoms or molecules. Mechanical: Pertaining to the design, operation, and use of machines or tools. Physical: Relating to the body as opposed to the mind or emotions, or being in a material state. Occult Blood: Blood that is not visible to the naked eye, often detected in stool or urine samples through laboratory tests.