Answer:
breed, while the ones not so well adapted die off.
It is compared by having a reference of something u know like biology
I'm trying my best !!!!
I think the answer is (C). I hope this helps! :)
Answer:
foreign cells.
Explanation:
Humoral and Cell-Mediated Immune Responses The immune system distinguishes two groups of foreign substances. One group consists of antigens that are freely circulating in the body. These include molecules, viruses, and foreign cells.
