True. While there are cases where this can be false, typically, the whole team is affected when one member of the team is being a problem.
If this is a true/false question, the answer is true.
Sorry the context of this question doesn’t make sense, can you explain further?
If you aren't checking yourself then you may have a problem. For example you could have testicular cancer and you wouldn't know without feeling an unusual bump in that area.
Antibodies, antigens are the bad things antibodies fight :)