People at health risks or vulnerable populations

What is the difference between a group \"at risk\" for poor health and a group considered a \"vulnerable\" population? Provide an example of an \"at risk\" or \"vulnerable population\" group in the United States and one in another country (or immigrants within the United States).
1. Explain why members of these groups cannot advocate for themselves or why advocating for these groups would be beneficial.
2. What would you advocate for?
3. Identify ethical issues that need to be addressed when working with these individuals.
4. Provide information about the selected \"at risk\" group. How many individuals fall into this group and what are some issues they face.