In order to answer this question, we should know what a pandemic means: it means a global epidemic.
A lot of epidemics are very local, for example Malaria is limited to places where mosquitoes are very active.
HIV/AIDS can be found in all parts of the world, so that makes it a pandemic - it goes everywhere humans go, because it can survive in all conditions where humans live
30 minutes because it takes a longer amount of time for you to burn calories from your body
Just relax and do what he said :))
The last one, A hypothesis is valuable whether or not they were correct or not.
