The most accurate statement is Inclusion and exclusion criteria are always needed in some form.
Inclusion criteria are the prospective subjects characteristics that should be taken into consideration in the study.
Exclusion criteria are set of predefined definitions commonly used to identify subjects who will not be included or those characteristics that disqualify prospective subjects for the study to be included
Your role is to take care of your body because its the only on you have. Your responsibility is to make sure your body is getting the nutrition and vitamins it needs. Making sure you drink enough water and keep as many chemicals out of your body as you can is a huge key to health. taking care of your body's outsides are just as important as taking care of your body's outsides, as well.
<em> I think that the answer is poverty</em>
It can be challenging because you have to learn at there pace when you have your own pace of working