The correct answer is A.
All of these signs would indicate substance abuse as they are all negative behaviors and would raise a red flag that something needs to be done to get him back to a healthy state and drug free. There are some signs in the other options that would indicate the same but not altogether as a whole.
Answer:
Innate immunity
Explanation:
Innate immunity refers to nonspecific defense mechanisms that come into play immediately or within hours of an antigen's appearance in the body. These mechanisms include physical barriers such as skin, chemicals in the blood, and immune system cells that attack foreign cells in the body.
I can’t see the options to pick from!
