Human's have 22 pairs of autosomes. Females have two copies of the x-chromosome.
Lymphocyte is one of body immune cells that works by fighting bacteria. To distinguish foreign material to body material, lymphocyte can detect a series of protein called antigen. Most antigen is represented by macrophages. In response to the antigen, lymphocyte might produce an antibody which will bind to the antigen.
Answer: Antigen
Answer:
From the youngest to the oldest :
E
D
A
B
C
