I think the answer is C. They are trying to emotionally avoid the exam by distracting themselves
Hope this helps :)
The statements above are true;
In a host-versus-graft rejection the recipient's immune system recognizes the donor's tissue as foreign and rejects the transplant. On the other hand, in a graft-versus-host rejection, the donor tissue recognizes the recipient's tissue as foreign and the transplant rejects the recipient, causing destruction of the recipient's tissue and possibly death. Its important also to note that there are two types of rejection, the acute rejection, where the rejection of transplanted tissue that occurs several weeks after transplant. it is delayed hypersensitivity reaction, and the chronic rejection is a rejection of transplanted tissue that can occur at a late time. Immune complexes form in the arteries supplying the graft, choking off the blood supply and the tissue is rejected.
Direct observation is an observation you make first hand. It is something you see with your own eyes and observe yourself.
Hope this helps!
Where are the questions cuz I don’t seem them either
<span>When Walter visited Thailand during his vacation, he was surprised to see green water at a beach. because. It is because </span><span>the ocean over this region has a high concentrations of phytoplankton from blue-green to green, depending upon the type and density of the population. The more phytoplankton in the water, the greener it is. </span>
