What is the difference between a group “at risk” for poor health and a group considered a “vulnerable” population?

What is the difference between a group “at risk” for poor health and a group considered a “vulnerable” population? Provide an example of a group at risk and a group considered a vulnerable population.

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?