Here a question in organic chemistry mechanism can any one help?​

Which of these properties, used alone, would be least useful in identifying most minerals? a. color b. luster c. streak d. density

You encounter a solution that is acidic and you decide to test it by adding a small amount of a strong acid. the ph lowers slightly but is approximately unchanged, and still remains acidic. what can you say about the solution? a. it is a buffer solution. b. it is not a buffer solution it is a strong acid solution. d. the solution has been neutralized. e. the solution has excess acid present

Select all of the methods through which a drug can enter your body. injection swallowing inhalation absorption