Drug addiction is a chronic disease characterized by compulsive, or uncontrollable, drug seeking and use despite harmful consequences and changes in the brain, which can be long lasting. These changes in the brain can lead to the harmful behaviors seen in people who use drugs. Drug addiction is also a relapsing disease. Relapse is the return to drug use after an attempt to stop.
Cancer cells the branch of medicine concerned with the studying and treatment of tumor.
Plasma proteins, or serum proteins. ☺️
Tennis helps with coordination. If that isn't one of the choices, let me know in a comment what the options are.
Gastro= Gastroenterology which has to do with the stomach