1a) C4H9N3

b)

c) Amine, the hybrid aromatic ring containing both carbon and nitrogen atoms.

2a) C16H21N3

b) Both compounds contain aromatic rings and amine functional groups.

3) Physiological response: a, b, d, e

Inhibition of the growth of substances: c, f

4a) Herbal remedy is safe if taken under doctor’s instruction, as the active ingredients in herbs are usually not in large amount. This makes herbal remedy has milder side effects. Not taking herbal remedy and prescription or OTC medicines at the same time can avoid the side effect issue. The herbal supplement is also regulated by government.

b) Herbal medicines are categorized as health supplements, which can be imported and sold without legislation.