Answer:
A: Added
B: Added
C:Removed
D:Added
Explanation:
Sorry if I am wrong but I think this is the answer :)
Immune tolerance is the lack of capacity to increase the
reaction to antigens. The tolerance can either be natural or “self” tolerance. On
the other hand, licensing is a kind of protein that lets replication for cells.
They usually happen with eukaryotic cells and they begin with the replication
of DNA.
To answer that question I would say A. source trait