Answer:
A. Interferons
Explanation:
According to Wikipedia, "Interferons are a group of signaling proteins made and released by host cells in response to the presence of several viruses. In a typical scenario, a virus-infected cell will release interferons causing nearby cells to heighten their anti-viral defenses."
Stress is NOT always negative
Positive stress (A stress) can help motivate you
1. Infected needles
2. Insect bite
3. Organ transplant
4. Blood transfusion
I believe it's either microwaves or x-rays
I studied this last year
Sex can have negative health consequences. Negative outcomes include, unwanted pregnancy, sexually transmitted infections, internal injury etc.
