Antigens are the substances .
It is determined by the presence of absence of antigens A and B on the surfaces of RBCs .
This is true i am positive
1. Heart disease
2. <span>Osteoporosis</span>
A baseline activity is something easy and simple that people can do everyday, which is something like putting away groceries and the reason for this is because people who only do baseline activity are seen as Inactive. while someone who walks to a friend's house is more active.
