Final answer:
Epidemiological evidence reveals patterns, causes, and effects of diseases in human populations. It shapes public health policies and medical practice by identifying risk factors and targets for preventive healthcare.
Step-by-step explanation:
Epidemiological evidence reveals patterns, causes, and effects of diseases in human populations. It plays a crucial role in shaping public health policies and medical practice by identifying risk factors for diseases and targets for preventive healthcare. Epidemiologists collect data about specific diseases, track their spread, and use this information to develop strategies for prevention and control.