Can someone look over my questions to see if they are right

Which challenges do countries face in limiting the spread of communicable diseases? check all that apply. 1. lack of vaccinations 2. lack of healthy food available 3. increase of worldwide travel 4. decrease of available clean water 5. increase in migration of infected animals

Synovial fluid serves as a lubricant to prevent friction between two parts that move on each other such as in the case of and bones.

What ethic groups are most affected by obesity and why?