Antigens are the substances .
It is determined by the presence of absence of antigens A and B on the surfaces of RBCs .
Answer:
c. many infected people do not know they are infected.
Explanation:
I'm pretty sure this is the right answer Sry if its not
She decides that her best course of action is to enjoy what she can without causing unnecessary pain. This is a smart choice since she has had arthroscopic surgery in the past and the age consideration. Also she is already acknowledging her knees are bothering her. Best to be safe than sorry.