Final answer:
Mandating seatbelt use and raising the purchasing age for tobacco are examples of policy-level determinants of health, focused on improving health outcomes through legal frameworks that influence personal behaviors.
Step-by-step explanation:
Mandating seatbelt use and raising the purchasing age for tobacco are both examples of policy-level determinants of health. These interventions aim to improve population health by reducing exposure to risk factors, thereby lowering the incidence of noncommunicable diseases and other health issues. Such policies are rooted in the understanding that personal choices, such as tobacco use and seat belt use, are heavily influenced by regulatory measures and that these choices significantly impact health outcomes and life expectancy. Public health policies that create legal frameworks to restrict or encourage certain behaviors are designed to lead to better health outcomes by preventing negative behaviors and promoting positive ones.