The answer is -The third line of defense involves the action of specialized cells.
The immune response is the method by which human body recognizes and defends itself against pathogens such as bacteria, viruses other harmful invaders. The immune system protects the body by recognizing and responding to antigens. The full -fledged immune response is the body’s third line of defence. When antigens make entry to the body, the immune system sees them as threats and stimulates the immune response by producing specialized antibodies against the antigen destroy them to protect our body.
What? Is this English? Sorry if I offended I’m just curious
Answer:
1. i think it's A 2.i think is D 3. I think C 4. I think B
Explanation:
A hairline<span> crack in a bone, especially of a foot or leg, caused by repeated or prolonged </span>stress. mark me brainlest
