What role is the President fulfilling when he chooses a Secretary of Labor?

The dictionary definiton of a word reflects the of that word?

The specific department of health and human services (hhs) regulations that apply to research with children are known as: subpart b: additional protections for children involved as subjects in researchsubpart a: the common rulesubpart d: additional protections for children involved as subjects in researchsubpart c: protections for children in research

Restricting immigrants from entering a country may be based on what belief?