Explanation:
under what circumstance does a negative cell presents An antigen to another negative cell
Answer:
Sorry, I'm confused there has to be more to it if there is not then there is no true way for anyone to fill in the blanks. <3
The answer is 2) 12 '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
Explanation:
But researchers in Israel have done a study showing that families have characteristic facial expressions, ones even shared by blind members of the families. The results suggests that such expressions may be inherited and thus under some genetic control.
