All of the above thank u very much
        
             
        
        
        
They help by doing experiments and finding ways to cure those with diseases etc
        
             
        
        
        
How much of a drug should be given at one time
How often it should be given per day
How will the drug will be taken, for example: by mouth or intravenously
        
             
        
        
        
Answer:
hey i just wanted to say hi please dont report me im rly chill lol.
Explanation: