[Solved] A system in which companies purchase raw materials only when needed is called: A)ABC. B)external failure costs. C)internal failure costs. D)JIT production. Bacteria: Microscopic, single-celled organisms found everywhere in the environment, which can be either beneficial or harmful to humans and other living beings. Occult Blood: Blood not visible to the naked eye, often detected in stool or urine samples to diagnose conditions such as gastrointestinal bleeding. Colon Cancer: A type of cancer that begins in the large intestine (colon), often detected through screening methods like colonoscopies. Screening Tools: Screening tools are instruments or tests used to identify the presence of diseases, conditions, or risk factors in individuals who do not yet show symptoms.